UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                 AMENDMENT NO. 4
                                       TO
                                  SCHEDULE 13D
                                 (Rule 13d-101)


                 INFORMATION TO BE INCLUDED IN STATEMENTS FILED
                PURSUANT TO RULE 13D-1(A) AND AMENDMENTS THERETO
                         FILED PURSUANT TO RULE 13D-2(A)

                                 PARTSBASE, INC.
                                ----------------
                                (Name of Issuer)

                         Common Stock - $.001 Par Value
                         ------------------------------
                         (Title of Class of Securities)

                                   70214P 109
                                 --------------
                                 (CUSIP Number)


                             Robert A. Hammond, Jr.
                              905 Clint Moore Road
                            Boca Raton, Florida 33487
                                 (561) 953-0700
               ------------------------------------------------
                 (Name, Address and Telephone Number of Person
               Authorized to Receive Notices and Communications)

                                 December 20, 2002
             -------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [_].





                                  SCHEDULE 13D
--------------------------------------------------------------------------------
                     |                                        |
CUSIP No. 70214P 109 |                                        |Page 2 of 8 Pages
--------------------------------------------------------------------------------

--------------------------------------------------------------------------------
  |
1 | NAME OF REPORTING PERSON
  | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
  |
  | Robert A. Hammond, Jr.
  | Social Security # - 034-44-8726
--------------------------------------------------------------------------------
  |
2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                (a): [ ]
  |                                                                  (b)  [x]
--------------------------------------------------------------------------------
  |
3 | SEC USE ONLY
  |
  |
  |
--------------------------------------------------------------------------------
  |
4 | SOURCE OF FUNDS*
  |
  | PF
  |
--------------------------------------------------------------------------------
  |
5 | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
  |   TO ITEMS 2(d) or 2(e)                                               [ ]
  |
  |
  |
--------------------------------------------------------------------------------
  |
6 | CITIZENSHIP OR PLACE OF ORGANIZATION
  |
  | United States
  |
--------------------------------------------------------------------------------
               |   |
    Number of  | 7 |  SOLE VOTING POWER
     Shares    |   |  10,521,200 shares of common stock
  Beneficially |----------------------------------------------------------------
   Owned by    | 8 |  SHARED VOTING POWER
    Each       |   |   0
  Reporting    |----------------------------------------------------------------
   Person      | 9 |  SOLE DISPOSITIVE POWER
    With       |   |  9,150,000 shares of common stock
               |----------------------------------------------------------------
               |10 |  SHARED DISPOSITIVE POWER
               |   |    0
--------------------------------------------------------------------------------
  |
11| AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
  |
  | 10,521,200 shares of common stock
  |
--------------------------------------------------------------------------------
  |
12| CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* [ }
  |
  |
  |
--------------------------------------------------------------------------------
  |
13| PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
  |
  | Approximately 74.3% of the issued and outstanding common stock.
  |
--------------------------------------------------------------------------------
   |
14 | TYPE OF REPORTING PERSON*
   |
   | IN
   |
--------------------------------------------------------------------------------
                                 SCHEDULE 13D
--------------------------------------------------------------------------------
                     |                                        |
CUSIP No. 70214P 109 |                                        |Page 3 of 8 Pages
--------------------------------------------------------------------------------

--------------------------------------------------------------------------------
  |
1 | NAME OF REPORTING PERSON
  | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
  |
  | R. Hammond LLP.
  | IRS Identification No.: 760-60-6066

--------------------------------------------------------------------------------
  |
2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                (a): [ ]
  |                                                                  (b)  [x]
--------------------------------------------------------------------------------
  |
3 | SEC USE ONLY
  |
  |
  |
--------------------------------------------------------------------------------
  |
4 | SOURCE OF FUNDS*
  |
  | WC
  |
--------------------------------------------------------------------------------
  |
5 | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
  |   TO ITEMS 2(d) or 2(e)                                               [ ]
  |
  |
  |
--------------------------------------------------------------------------------
  |
6 | CITIZENSHIP OR PLACE OF ORGANIZATION
  |
  | Texas, United States
  |
--------------------------------------------------------------------------------
               |   |
    Number of  | 7 |  SOLE VOTING POWER
     Shares    |   |  0 shares of common stock
  Beneficially |----------------------------------------------------------------
   Owned by    | 8 |  SHARED VOTING POWER
    Each       |   |  4,500,000
  Reporting    |----------------------------------------------------------------
   Person      | 9 |  SOLE DISPOSITIVE POWER
    With       |   |  0 shares of common stock
               |----------------------------------------------------------------
               |10 |  SHARED DISPOSITIVE POWER
               |   |  4,500,0000
--------------------------------------------------------------------------------
  |
11| AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
  |
  | 4,500,000 shares of common stock
  |
--------------------------------------------------------------------------------
  |
12| CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* [ }
  |
  |
  |
--------------------------------------------------------------------------------
  |
13| PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
  |
  | Approximately 32.1% of the issued and outstanding common stock.
  |
--------------------------------------------------------------------------------
   |
14 | TYPE OF REPORTING PERSON*
   |
   | PN
   |
--------------------------------------------------------------------------------

 SCHEDULE 13D
--------------------------------------------------------------------------------
                     |                                        |
CUSIP No. 70214P 109 |                                        |Page 4 of 8 Pages
--------------------------------------------------------------------------------

--------------------------------------------------------------------------------
  |
1 | NAME OF REPORTING PERSON
  | S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
  |
  | Hammond I, Inc.
  | IRS Identification No.: 03-0444766

--------------------------------------------------------------------------------
  |
2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                (a): [ ]
  |                                                                  (b)  [x]
--------------------------------------------------------------------------------
  |
3 | SEC USE ONLY
  |
  |
  |
--------------------------------------------------------------------------------
  |
4 | SOURCE OF FUNDS*
  |
  | WC
  |
--------------------------------------------------------------------------------
  |
5 | CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
  |   TO ITEMS 2(d) or 2(e)                                               [ ]
  |
  |
  |
--------------------------------------------------------------------------------
  |
6 | CITIZENSHIP OR PLACE OF ORGANIZATION
  |
  | Florida, United States
  |
--------------------------------------------------------------------------------
               |   |
    Number of  | 7 |  SOLE VOTING POWER
     Shares    |   |  0 shares of common stock
  Beneficially |----------------------------------------------------------------
   Owned by    | 8 |  SHARED VOTING POWER
    Each       |   |  1,371,200 shares of common stock
  Reporting    |----------------------------------------------------------------
   Person      | 9 |  SOLE DISPOSITIVE POWER
    With       |   |  1,371,200 shares of common stock
               |----------------------------------------------------------------
               |10 |  SHARED DISPOSITIVE POWER
               |   |  0 shares of common stock
--------------------------------------------------------------------------------
  |
11| AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
  |
  | 1,371,200 shares of common stock
  |
--------------------------------------------------------------------------------
  |
12| CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* [ }
  |
  |
  |
--------------------------------------------------------------------------------
  |
13| PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
  |
  | Approximately 9.8% of the issued and outstanding common stock.
  |
--------------------------------------------------------------------------------
   |
14 | TYPE OF REPORTING PERSON*
   |
   | CO
   |
--------------------------------------------------------------------------------



                                   ATTACHMENT

                                                            CUSIP No. 70214P 109

Item 2.  Identity and Background.

     This  statement  of  beneficial  ownership   constitutes  Amendment  No.  4
("Amendment No. 4") to that the initial joint filing by Robert A. Hammond,  Jr.,
and R. Hammond,  L.P., a Texas limited  partnership on Schedule 13D on April 10,
2002 (the  "Initial  Schedule"),  as amended on Amendment  No. 1 to Schedule 13D
filed on May 3, 2002 ( "Amendment No. 1"), Amendment No. 2 to Schedule 13D filed
on June 3, 2002  ("Amendment  No. 2"), and Amendment No. 3 to Schedule 13D filed
on August 27, 2002 ("Amendment No. 3"), pursuant to Rule 13d-1(k) promulgated by
the  Securities  and  Exchange  Commission  under  Section 13 of the  Securities
Exchange Act of 1934,  as amended (the "Act").  Robert A.  Hammond,  Jr., and R.
Hammond,  L.P., a Texas  limited  partnership,  together with Hammond I, Inc., a
Florida corporation,  (collectively, the "Reporting Persons," each, a "Reporting
Person"),  are making this single,  joint  filing  because they may be deemed to
constitute  a "group"  within the  meaning of Section  13(d)(3)  of the Act with
respect to the  transaction  described  in Item 4 of the  Initial  Schedule,  as
amended by Amendment No. 1,  Amendment No. 2, Amendment No. 3, and Amendment No.
4. The agreement  between the Reporting  Persons relating to the joint filing of
this statement is attached hereto as Exhibit A.

     Information  with respect to each of the Reporting  Persons is given solely
by such Reporting Person, and no Reporting Person assumes responsibility for the
accuracy or  completeness  of the  information  concerning  the other  Reporting
Person, except as otherwise provided in Rule 13d-1(k).

     Mr. Hammond serves as President,  Chief  Executive  Officer and Chairman of
the Board of PartsBase.  The business  address for Mr.  Hammond and PartsBase is
905 Clint Moore Road, Boca Raton, Florida 33487.

     R. Hammond,  L.P. is a Texas limited  partnership.  Mr. Hammond is the sole
general  partner  of the  partnership.  The  business  address  for the  limited
partnership is 600 North Shepard Drive, Suite 303, Houston, Texas 77007.

     Hammond  I,  Inc.  is a  Florida  corporation.  Mr.  Hammond  is  the  sole
shareholder  of Hammond I, Inc., and serves as its  President,  Chief  Executive
Officer and Chairman of the Board.  The business  address for Hammond I, Inc. is
905 Clint Moore Road, Boca Raton, Florida 33487.

     None of the Reporting  Persons have been,  during the past five years,  (i)
convicted in a criminal  proceeding  (excluding  traffic  violations and similar
misdemeanors);  or  (ii)  a  party  to  a  civil  proceeding  of a  judicial  or
administrative body of competent  jurisdiction which had the result of either of
them  being  subject  to a  judgment,  decree or final  order  enjoining  future
violations  of, or prohibiting  or mandating  activities  subject to, federal or
state securities laws or finding any violation with respect to such laws.

     Mr. Hammond is a citizen of the United States of America, R. Hammond,  L.P.
is a Texas limited partnership, and Hammond I, Inc., is a Florida corporation.

Item 3.  Source and Amount of Funds or Other Consideration.

     Substantially  all of the shares of Mr.  Hammond and R. Hammond,  L.P. were
acquired in  connection  with the formation  and  incorporation  of PartsBase in
April 1999. Mr. Hammond was granted 150,000 options to purchase PartsBase Common
Stock in June 2001. The options are  exercisable at $2.00 per share.  Hammond I,
Inc. acquired beneficial ownership of its shares as a result of the execution of


                                       5


a Voting Agreement,  a copy of which is attached hereto as Exhibit B, as further
described in Section 6.

Item 4.  Purpose of Transaction.

     As  disclosed  in the  Initial  Schedule,  as amended by  Amendment  No. 1,
Amendment No. 2, and Amendment No. 3, the Reporting Persons submitted a proposal
to the Board of  Directors  of  PartsBase  on April 5, 2002,  a copy of which is
attached to the Initial Schedule (the "April 5th Proposal Letter"),  pursuant to
which the Reporting Persons,  through a company to be formed,  would acquire all
of the outstanding  shares of common stock of PartsBase,  in accordance with the
terms and conditions set forth  therein.  The April 5th Proposal  Letter set the
price to be paid in the proposed merger at $1.02 per share.

     On May 30, 2002, the Reporting Persons submitted a proposal to the Board of
Directors,  a copy of which is  attached  to  Amendment  No.  2 (the  "May  30th
Proposal  Letter")  increasing the price to be paid in the proposed  merger from
$1.02 per share to $1.25 per share.

     On August 26,  2002,  the Board of  Directors  of  PartsBase  approved  the
transaction with the Reporting Persons, based upon a purchase price of $1.41 per
share. On August 26, 2002,  PartsBase and the Reporting  Persons entered into an
Agreement  and Plan of Merger  setting  forth the terms of their  agreement,  as
further  described in the PartsBase  press release dated August 26, 2002, a copy
of which is attached to Amendment No. 3.

     On December 20, 2002, Hammond I, Inc., a Florida corporation, Atlas II, LP,
a New York limited partnership  ("Atlas"),  and Marathon Partners LP, a New York
limited  partnership  ("Marathon"),  entered into a Voting Agreement,  a copy of
which is attached  hereto as Exhibit B. The Voting  Agreement  provides that the
purchase price in the merger transaction shall increase to $1.50 per share.

Item 5.  Interest in Securities of the Issuer.

     As of December 20, 2002, Mr. Hammond  beneficially  owned 10,521,200 shares
of Common Stock, constituting to the best of his knowledge,  75.1% of the issued
and outstanding  shares of Common Stock.  Mr. Hammond has sole voting power over
10,520,400  shares  of  Common  Stock  beneficially  owned by him,  and has sole
dispositive  power over 9,150,000 shares of Common Stock  beneficially  owned by
him.

     As of December 20, 2002,  R. Hammond,  L.P.  beneficially  owned  4,500,000
shares of Common Stock, constituting, to the best of its knowledge, 32.1% of the
issued and outstanding  shares of Common Stock. Mr. Hammond,  a general partner,
has sole  voting and  dispositive  power over all of the shares of Common  Stock
beneficially owned by R. Hammond, L.P.

     As of December  20,  2002,  Hammond I, Inc.  beneficially  owned  1,371,200
shares of Common Stock, constituting,  to the best of its knowledge, 9.8% of the
issued and outstanding shares of Common Stock, pursuant to the terms of a Voting
Agreement, a copy of which is attached hereto as Exhibit B, as further described
in Section 6. Mr.  Hammond,  the sole  shareholder,  President,  Chief Executive
Officer,  and  Chairman of the Board of Hammond I, Inc.,  has sole voting  power
over all of the shares of Common Stock beneficially owned by Hammond I, Inc.

                                       6


     None of the Reporting  Persons has effected any  transactions in the Common
Stock during the past 60 days.

Item 6.  Contracts, Arrangements, Understandings or Relationships with Respect
          to securities of the Issuer.

     On December 20, 2002,  Hammond I, Inc.,  Atlas, and Marathon entered into a
Voting  Agreement,  a copy of which is attached  hereto as Exhibit B. The Voting
Agreement provides that the purchase price in the merger  transaction  described
in  Section 4 shall  increase  to $1.50  per  share.  In  addition,  the  Voting
Agreement  provides  that:  (i) Neither Atlas nor Marathon shall transfer any of
the 1,371,200 shares of Common Stock of PartsBase,  Inc.  beneficially  owned by
Atlas and Marathon,  except pursuant to the terms of the Voting Agreement,  (ii)
Atlas and Marathon shall vote their shares of Common Stock of PartsBase, Inc. in
favor of the merger transaction, and against any action or agreement which would
impede,  frustrate,  interfere  with or prevent the merger,  including any other
acquisition proposal,  (iii) until the termination of the Voting Agreement Atlas
and Marathon  appoint Hammond I, Inc. and any nominee  thereof,  their proxy and
attorney-in-fact (with full power of substitution),  for and in the name, place,
and stead of Atlas  and  Marathon,  to vote  their  shares  of  Common  Stock of
PartsBase,  Inc. in connection  with any meeting or action by written consent of
the  stockholders  of PartsBase,  Inc., in favor of the merger,  and against any
action or agreement  which would impede,  interfere  with or prevent the merger,
including  any  other  acquisition  proposal,  and (iv) the  foregoing  proxy is
irrevocable and coupled with an interest.

Item 7. Material to be Filed as an Exhibit.

        Exhibit A - Joint Filing Agreement dated December 20, 2002 by and
                    between the Reporting Persons.

        Exhibit B - Voting Agreement between Hammond I, Inc., Atlas II, LP, and
                    Marathon Partners LP, dated December 20, 2002.

                                       7


                                    SIGNATURE

     After  reasonable  inquiry and to the best of my knowledge and belief,  the
undersigned  certifies that the information set forth in this statement is true,
complete and correct.

Dated:  December 20, 2002


                                             ROBERT A. HAMMOND, JR.


                                             /s/ Robert A. Hammond, Jr.
                                             --------------------------
                                             Robert A. Hammond, Jr.



                                             R. HAMMOND, L.P.


                                             By:/s/ Robert A. Hammond, Jr.
                                             --------------------------
                                                  Robert A. Hammond, Jr.
                                                      General Partner


                                             HAMMOND I, INC.


                                             By:/s/ Robert A. Hammond, Jr.
                                             --------------------------
                                                  Robert A. Hammond, Jr.
                                                      President

                                       8


--------------------------------------------------------------------------------
                                    Exhibit A

                             Joint Filing Agreement


     In accordance with Rule  13d-1(k)(1)  under the Securities  Exchange Act of
1934, as amended,  each of the undersigned  parties hereby agree to file jointly
the statement on Schedule 13D (including any amendments thereto) with respect to
the Common Stock, $.001 par value per share, of PartsBase, Inc.

     It is understood  and agreed that each of the parties hereto is responsible
for the timely filing of such statement and any amendments thereto,  and for the
completeness  and  accuracy  of  information  concerning  such  party  contained
therein,  but such party is not responsible for the completeness and accuracy of
information  concerning the other party unless such party knows or has reason to
believe that such information is inaccurate.

     It is understood and agreed that a copy of this agreement shall be attached
as an exhibit to the  statement  on Schedule  13D, and any  amendments  thereto,
filed on behalf of the parties hereto.

Dated:   December 20, 2002
                                             ROBERT A. HAMMOND, JR.


                                             /s/ Robert A. Hammond, Jr.
                                             --------------------------
                                             Robert A. Hammond, Jr.



                                             R. HAMMOND, L.P.


                                             By:/s/ Robert A. Hammond, Jr.
                                             --------------------------
                                                  Robert A. Hammond, Jr.
                                                      General Partner


                                             HAMMOND I, INC.


                                             By:/s/ Robert A. Hammond, Jr.
                                             --------------------------
                                                  Robert A. Hammond, Jr.
                                                      President

                                       1


--------------------------------------------------------------------------------

                                   Exhibit B


           Voting Agreement between Hammond I, Inc., Atlas II, LP, and
                 Marathon Partners LP, dated December 20, 2002.



                                VOTING AGREEMENT

     VOTING AGREEMENT (this "AGREEMENT"),  dated as of December 20, 2002, by and
among  Hammond  Acquisition  Corp.   ("HAC"),  a  Delaware   corporation  and  a
wholly-owned  subsidiary of Hammond I, Inc., a Florida corporation  ("Hammond"),
and the entity listed on the Signature Page hereto (the "Stockholders").

     WHEREAS,  the  Stockholders  are, as of the date hereof,  have voting power
over the number of shares of common stock,  par value $0.01 per share  ("Company
Common Stock"), of PartsBase,  Inc., a Delaware corporation (the "Company"), set
forth on the Signature Page hereto;

     WHEREAS, Hammond and the Company have entered into an Agreement and Plan of
Merger,  dated as of August 26, 2002 (the "Merger Agreement";  capitalized terms
used but not  defined  herein  have the  meanings  ascribed to such terms in the
Merger Agreement),  which provides for the merger (the "Merger") of HAC with and
into the Company upon the terms and subject to the  conditions  set forth in the
Merger Agreement;

     WHEREAS,  pursuant  to the Merger  Agreement  each share of Company  Common
Stock,  owned by the stockholders of the Company as of the Effective Time of the
Merger will be converted  into the right to receive cash, as set forth  therein;
and the Board of  Directors of the Company has approved the Merger and the other
transactions  contemplated in the Merger Agreement and is recommending  that the
Company's stockholders approve the Merger; and

     WHEREAS,  as a condition  to the  willingness  of Hammond to  increase  the
Merger  consideration to $1.50 per share to induce, the Stockholders have agreed
to enter into this Agreement.

     NOW,  THEREFORE,  in consideration of the execution and delivery by Hammond
of the  Merger  Agreement  and the  foregoing  and the  mutual  representations,
warranties,  covenants and  agreements  set forth herein and therein,  and other
good and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, the parties hereto agree as follows:

     SECTION 1.  Representations,  Warranties and Covenants of the Stockholders.
The Stockholders (i) have voting power over the beneficial  owners the shares of
Company Common Stock and the options and warrants to purchase  shares of Company
Common Stock  indicated  on the  Signature  Page  hereto,  free and clear of any
liens,  claims,  options,  rights of first refusal,  co-sale rights,  charges or
other  encumbrances that, in each case, would deprive Hammond of the benefits of
this Agreement  (other than any rights of repurchase held by the Company);  (ii)
do not have voting power over the number of shares of Company  Common Stock held
for clients in managed accounts indicated on the signature page hereto; (iii) do
not have voting power over any  securities  of the Company other than the shares
of Company  Common Stock and options and warrants to purchase  shares of Company


                                       1


Common Stock  indicated on the Signature  Page hereto;  (iv) have full power and
authority to make,  enter into and carry out the terms of this Agreement and the
proxy contained herein;  and (iv) will not, and will not permit any "affiliates"
to: (1) solicit proxies or become a "participant" in a  "solicitation"  (as such
terms are defined in  Regulation  14A under the Exchange Act of 1934, as amended
(the  "Exchange  Act"))  with  respect to any action or  agreement  which  would
impede,  frustrate,  interfere  with or prevent the Merger,  including any other
Acquisition  Proposal,  or otherwise  encourage or assist any party in taking or
planning any action that would  compete  with,  restrain or  otherwise  serve to
interfere  with or inhibit the timely  consummation  of the Merger in accordance
with the terms of the Merger  Agreement;  (2) initiate a  stockholder's  vote or
action by written consent of the Company stockholders with respect to any action
or agreement which would impede, interfere with or prevent the Merger, including
any other  Acquisition  Proposal;  or (3) become a member of a "group"  (as such
term is used in Section  13(d) of the  Exchange  Act) with respect to any voting
securities  of the Company with  respect to any action or agreement  which would
impede,  interfere with or prevent the Merger,  including any other  Acquisition
Proposal except for a group with Hammond.

     SECTION 2. Agreement Not to Transfer Shares.

     (a)  Prior  to the  termination  of this  Agreement,  except  as  otherwise
provided  herein,  the  Stockholders  shall not: (i) transfer  (which term shall
include, without limitation, for the purposes of this Agreement, any sale, gift,
pledge or other  disposition),  or consent to any transfer of, any or all of the
Shares (as defined in Section  2(b));  (ii) enter into any  contract,  option or
other agreement or  understanding  with respect to any transfer of any or all of
the Shares or any interest therein; (iii) grant any proxy,  power-of-attorney or
other authorization or consent in or with respect to the Shares; or (iv) deposit
the Shares into a voting trust or enter into a voting  agreement or  arrangement
with respect to the Shares.

     (b) "SHARES" shall mean:  (i) all securities of the Company  (including all
shares of Company Common Stock,  Preferred  Stock and all options,  warrants and
other rights to acquire such securities)  which the  Stockholders  having voting
power as of the date of this  Agreement;  and (ii) all additional  securities of
the Company  (including  all shares of Company  Common Stock and all  additional
options,  warrants  and other rights to acquire  such  securities)  of which the
Stockholders  acquire  voting  power  during  the  period  from the date of this
Agreement  through  the  Effective  Time.  In the event of a stock  dividend  or
distribution, or any change in Company Common Stock or Preferred Stock by reason
of any stock  dividend,  split-up,  recapitalization,  combination,  exchange of
shares or the like,  the term  "SHARES"  shall be deemed to refer to and include
the  Shares  as well as all  such  stock  dividends  and  distributions  and any
securities  into  which or for which any or all of the  Shares may be changed or
exchanged or which are received in such transaction.

     SECTION  3.  Agreement  to  Vote  Shares;   Grant  of  Irrevocable   Proxy;
Appointment of Proxy.

     (a) Prior to the termination of this Agreement,  except as provided herein,
the Stockholders shall vote Stockholders' Shares, in connection with any meeting
or action by written consent of the  stockholders of the Company (i) in favor of
the  Merger,  and (ii)  against  any action or  agreement  which  would  impede,
frustrate, interfere with or prevent the Merger, including any other Acquisition


                                       2


Proposal. Stockholders agree not, directly or indirectly, to solicit or initiate
any offer  from any party  concerning  the  possible  disposition  of all or any
substantial portion of the Company's business, assets or capital stock.

     (b)  Until the  termination  of this  Agreement,  the  Stockholders  hereby
irrevocably  grant to, and appoint,  Hammond and any nominee thereof,  its proxy
and  attorney-in-fact  (with full power of  substitution),  for and in the name,
place, and stead of the Stockholders,  to vote Stockholders'  Shares, or grant a
consent or approval in respect of Stockholders'  Shares,  in connection with any
meeting or action by written  consent of the  stockholders of the Company (i) in
favor of the  Merger,  and (ii)  against  any action or  agreement  which  would
impede,  interfere with or prevent the Merger,  including any other  Acquisition
Proposal.

     (c) The Stockholders represent that any proxies heretofore given in respect
of the Shares are not irrevocable, and that such proxies are hereby revoked.

     (d) Subject to Section 5 hereof,  the  Stockholders  hereby affirm that the
proxy set forth in this Section 3 is irrevocable and is given in connection with
the increase in the cash consideration, and that such irrevocable proxy is given
to  secure  the  performances  of the  duties  of the  Stockholders  under  this
Agreement.  The  Stockholders  hereby further affirm that the irrevocable  proxy
granted  hereby is coupled with an interest in the Shares and, is intended to be
irrevocable in accordance  with the provisions of Section 212(e) of the Delaware
General Corporation Law.

     (e) The  Stockholders  will  advise  its  clients  to vote  shares  held by
Stockholder  (which the  Stockholders  do not have voting  power) for clients in
managed accounts,  the number of such shares is indicated on the Signature Page,
to vote their shares, consistent with the proxy granted under Section 3.

     SECTION 4. Further Assurances. From time to time, upon request of the other
party and without  further  consideration,  each party hereto shall  execute and
deliver  any  additional  documents  and take  such  further  actions  as may be
necessary to carry out the provisions hereof. The Stockholders agree, to testify
or  provide  other  assistance  in  the  event  this  Agreement  or  the  Merger
consideration is challenged,  and Hammond shall reimburse Stockholders for their
reasonable  out of pocket  expenses and costs  associated  with such  assistance
(exclusive of any appearance  fees or stipends),  however Hammond shall only pay
one-half of such costs and expenses if such action seeks a temporary injunction.
The  Stockholders  agree to amend the existing  Schedule 13D, at their own cost,
stating  their firm intent to vote in favor of the  Merger;  the timing of which
shall be at the  discretion  of  Hammond  but in  compliance  with the rules and
regulations of the Securities and Exchange Commission.  Hammond shall also amend
its Schedule 13D, consistent with the terms of this Agreement.

     SECTION 5.  Termination.  Except as otherwise  provided in this  Agreement,
this Agreement,  and all rights and obligations of the parties hereunder,  shall
terminate  immediately  upon the  earlier of (i) the  termination  of the Merger
Agreement  in  accordance  with its terms,  unless prior to such  termination  a
person  or  entity  shall  have  made  an  Acquisition  Proposal  and  (ii)  the
consummation of the Merger. Sections 3(a) and 3(b) will terminate on the earlier
(x) the date  computed  in  accordance  with  the  previous  sentence  or (y) by
September 30, 2003.  Nothing in this section shall relieve the Stockholders from


                                       3


liability  or breach  of this  Agreement.  Sections  6 and 8 shall  survive  any
termination of this Agreement.

     SECTION 6. Expenses; Indemnification. All fees and expenses incurred by any
one party  hereto shall be borne by the party  incurring  such fees and expenses
Notwithstanding the foregoing,  Hammond shall indemnify  Stockholders,  and hold
them harmless from and against any expenses and liabilities claimed by any party
in connection with any proceeding  associated with Stockholders  being deemed to
be a member of the Hammond group or by virtue of granting the irrevocable  proxy
pursuant to this  Agreement to the fullest extent  permitted by applicable  law,
the Certificate of  Incorporation of the bylaws of Hammond in effect on the date
hereof or as such law,  Certificate of  Incorporation or bylaws may from time to
time be amended (but, in the case of any such amendment, only to the extent such
amendment  permits  Hammond to provide broader  indemnification  rights than the
law, the Certificate of Incorporation or the bylaws permitted Hammond to provide
before such  amendment).  Without  diminishing the scope of the  indemnification
provided by this Section 6, Hammond shall indemnify  Stockholders  whenever they
are a party or are  threatened to be made a party to any  proceeding,  including
without  limitation any such proceeding brought by or in the right of PartsBase,
Inc. or stockholders  therein,  because Stockholders are or were a member of the
Hammond  group by virtue of granting the  irrevocable  proxy with respect to the
Merger,  or  because  of  anything  done  or not  done by  Stockholders  in such
capacity,  against expenses and liabilities  actually and reasonably incurred by
Stockholders  or on their behalf in connection with such  proceeding,  including
the costs of any investigation,  defense,  settlement or appeal. In addition to,
and not as a limitation  of, the  foregoing,  the rights of  indemnification  of
Stockholders  provided  under this  Agreement  shall  include the advance of all
reasonable expenses (as mutually agreed to by all parties),  including attorneys
fees,  incurred or to be incurred by or on behalf of  Stockholders  from time to
time, and shall be paid by Hammond to Stockholders within thirty (30) days after
the receipt by Hammond of a written request for an advance of expenses,  whether
prior to or after final disposition of a proceeding.

     SECTION 7. Public Announcements. Neither the Stockholders, nor any of their
affiliates  shall issue or cause the  publication  of any press release or other
public  announcement  with respect to this  Agreement or the other  transactions
contemplated hereby without the prior written consent of Hammond,  except as may
be  required  by law in which  circumstance  such  announcing  party  shall make
reasonable efforts to consult with the Hammond to the extent practicable.

     SECTION 8. Board  Approval.  The Board of  Directors of the Company has, to
the extent required by applicable law, duly and validly  authorized and approved
all necessary corporate action, this Agreement and the transactions contemplated
hereby, so that by the execution and delivery hereof no restrictive provision of
any  "fair  price,"   "moratorium,"   control  share  acquisition,   "interested
shareholders"  or  similar  anti-takeover  statute  or  regulation,  restrictive
provision  of  any  applicable   takeover   provision  in  the   Certificate  of
Incorporation or Bylaws of the Company is, or will be applicable to the Company,
the Shares or the transaction contemplated by this Agreement.

                                       4


     SECTION 9. Miscellaneous.

     (a)  Severability.  If any term or other  provision  of this  Agreement  is
invalid,  illegal or incapable  of being  enforced by any rule of law, or public
policy, all other conditions and provisions of this Agreement shall nevertheless
remain in full force and effect so long as the  economic or legal  substance  of
the transactions  contemplated  herein are not affected in any manner materially
adverse  to any party  hereto.  Upon such  determination  that any term or other
provision is invalid, illegal or incapable of being enforced, the parties hereto
shall  negotiate  in good  faith to modify  this  Agreement  so as to effect the
original  intent of the parties as closely as possible in a mutually  acceptable
manner.

     (b) Binding Effect and  Assignment.  The provisions of this Agreement shall
be  binding  upon and  inure to the  benefit  of the  parties  hereto  and their
respective  successors  and  assigns;  no party to this  Agreement  may  assign,
delegate  or  otherwise  transfer  any of its rights or  obligations  under this
Agreement without the prior written consent of the other parties hereto.

     (c)  Amendments  and  Modification.  Except as may  otherwise  be  provided
herein,  any provision of this  Agreement may be amended,  modified or waived by
the parties  hereto if, and only if, such  amendment or waiver is in writing and
signed, in the case of an amendment, by the parties hereto, and in the case of a
waiver, by the party against whom the waiver is to be effective.

     (d) Specific Performance; Injunctive Relief. The parties hereto acknowledge
that  Hammond  shall be  irreparably  harmed and that there shall be no adequate
remedy at law for a  violation  of any of the  covenants  or  agreements  of the
Stockholders set forth herein.  Therefore, it is agreed that, in addition to any
other remedies that may be available to Hammond upon any such violation, Hammond
shall  have the right to enforce  such  covenants  and  agreements  by  specific
performance, injunctive relief or by any other means available to Hammond at law
or in equity without the necessity of proving the inadequacy of money damages as
a remedy.

     (e)  Notices.   All   notices,   requests,   demands,   waivers  and  other
communications  required or  permitted  to be given under this  Agreement to any
party hereunder shall be in writing and deemed given upon (a) personal delivery,
(b)  transmitter's  confirmation of a receipt of a facsimile  transmission,  (c)
confirmed  delivery by a standard overnight carrier or when delivered by hand or
(d) when mailed in the United  States by certified or registered  mail,  postage
prepaid,  addressed at the  following  addresses (or at such other address for a
party as shall be specified by notice given hereunder):

     If to Hammond:                 Hammond I, Inc.
                                    905 Clint Moore Road
                                    Boca Raton, FL 33487
                                    Attention:  Robert A. Hammond, Jr.
                                    Facsimile No.: (561) 953-0787

                                       5



     With a copy to:
                                    Adorno & Yoss, P.A.
                                    Suite 1700
                                    350 East Las Olas Boulevard
                                    Fort Lauderdale, FL 33301
                                    Attention: Joel D. Mayersohn, Esq.
                                    Facsimile No.: (954) 766-7800

     If to  the  Stockholders:  To the  address  for  notice  set  forth  on the
signature page hereof.
     With copies to:             David C. Adams
                                 Bartel Eng & Schroder
                                 300 Capitol Mall, Suite 1100
                                 Sacramento, California 95814
                                 Facsimile No.: (916) 442-3442

     (f)  Governing  Law. This  Agreement  shall be governed by and construed in
accordance  with the laws of the State of Delaware  (regardless of the laws that
might otherwise govern under applicable principles of conflicts of laws thereof)
as to  all  matters,  including,  but  not  limited  to,  matters  of  validity,
construction, effect, performance and remedies.

     (g) Entire Agreement. This Agreement constitutes the entire agreement among
the parties  hereto with respect to the subject matter hereof and supersedes all
other prior  agreements or  understandings,  both written and oral,  between the
parties or any of them with respect to the subject matter hereof.

     (h) Effect of Headings.  The article and section headings contained in this
Agreement are solely for the purpose of reference, are not part of the agreement
of  the  parties  hereto  and  shall  not in  any  way  affect  the  meaning  or
interpretation of this Agreement.

     (i)   Counterparts.   This  Agreement  may  be  signed  in  any  number  of
counterparts, each of which shall be deemed an original, with the same effect as
if the signatures thereto and hereto were upon the same instrument.

                  [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]


                                       6



     The  foregoing  Agreement  is hereby  executed  as of the date first  above
written.

                                        "HAMMOND"

                                        HAMMOND I, INC.,
                                        a Florida corporation


                                        By:/s/Robert A.Hammond Jr.
                                           -----------------------
                                        Name: Robert A. Hammond Jr.
                                             ----------------------
                                        Title:President
                                              ---------


                                        "STOCKHOLDERS"

                                        ATLAS II, L.P.,
                                        a New York Limited Partnership


                                        By:/s/ Richard Jacinto, II
                                           -----------------------
                                        Name:Richard Jacinto, II
                                             -------------------
                                        Title: General Partner
                                              ----------------

                                        Voting Power Over:
                                        ------------------
                                           866,800 shares of Company Common
                                           Stock
                                           0 shares of Company Common Stock
                                           issuable upon exercise of options

                                        MARATHON PARTNERS, L.P.,
                                        a New York Limited Partnership


                                        By:/s/ Mario Cibelli
                                           -----------------
                                        Name: Mario Cibelli
                                             --------------
                                        Title: General Partner
                                              ----------------

                                        Voting Power Over:
                                        ------------------
                                           504,400 shares of Company Common
                                           Stock
                                           0 shares of Company Common Stock
                                           issuable upon exercise of options
                                           100,800 held on behalf of clients'
                                           managed accounts

                                       7