Document:

<PAGE>

                                                                   Exhibit 10.27

                                 William McKay
                               2240 Buena Vista
                              Irwindale, CA 91706

                               February 10, 2000

BY TELECOPY
-----------

Samuel T. Mok., Voting Trustee
1001 Connecticut Avenue, N.W.
Suite 1035
Washington, D.C. 20036
Attention: Samuel T. Mok

     and also to,

Sunbase Asia, Inc.
Smith Acquisition Company d/b/a Southwest Products Company, Inc.

Dear Ladies and Gentlemen:

     This letter agreement shall represent an amendment to that certain Stock
Purchase Agreement (the "Stock Purchase Agreement") pursuant to which William
                         ------------------------
McKay has agreed to acquire all of the issued and outstanding capital stock of
Smith Acquisition Company d/b/a Southwest Products Company, Inc..

     Section 1.2 of the Stock Purchase Agreement shall be amended read as
     -----------
follows:

          1.2  Time and Place of Closing.

               (a)  The closing of the transactions contemplated hereby (the
     "Closing") will take place on April 10, 2000, or such earlier date as the
      -------
     parties may agree in writing (the "Closing Date"). The Closing shall be
                                        ------------
     held at the offices of Jenkens & Gilchrist, 1919 Pennsylvania Ave., N.W.,
     Suite 600, Washington, D.C. 20006, or such location as may be agreed upon
     by the parties.
<PAGE>

A substitute page that amends Section 1.2 to that effect is attached herewith
(to replace page 1 of the Stock Purchase Agreement).

     Section 4.2 is amended to insert: "10,000,000 shares of common stock, no
par value, and 4,000,000 shares of preferred stock, no par value".

A substitute page that sets forth in Section 4.2 the number of issued and
authorized shares of the Company is attached herewith (to replace page 4 of the
Stock Purchase Agreement).

                                          WILLIAM MCKAY

                                          By: /s/ William Reed McKay
                                             -----------------------------------
                                             Print Name: William Reed McKay
                                                        ------------------------

                                          AGREED AND ACCEPTED:

                                          SMITH ACQUISITION COMPANY D/B/A
                                          SOUTHWEST PRODUCTS COMPANY, INC.

                                          By: /s/ Samuel T. Mok
                                             -----------------------------------
                                             Name: SAMUEL T. MOK
                                                  ------------------------------
                                             Title: CHAIRMAN
                                                   -----------------------------

                                          SAMUEL T. MOK
                                          Voting Trustee

                                          By: /s/ Samuel T. Mok
                                             -----------------------------------
                                             Print Name: SAMUEL T. MOK
                                                        ------------------------
<PAGE>

                                          SUNBASE ASIA, INC.

                                          By: /s/ Li Yuen Fai Roger
                                             -----------------------------------
                                             Name: LI YUEN FAI ROGER
                                                  ------------------------------
                                             Title: CHIEF FINANCIAL OFFICER
                                                   -----------------------------<PAGE>

                                                                   Exhibit 10.28

                            ASSIGNMENT OF RIGHTS IN
                           STOCK PURCHASE AGREEMENT

WHEREAS:

a.   On January 31, 2000, William McKay entered into a Stock Purchase Agreement
     (the "Agreement") with Smith Acquisition Company, Inc., d/b/a Southwest
     Products Company, Inc. (the "Company"), Sunbase Asia, Inc. and Samuel T.
     Mok, Trustee, to purchase all of the outstanding stock of the Company from
     Sunbase Asia, Inc. and Samuel T. Mok, Trustee.

b.   The Agreement does not permit the assignment of a party's rights under the
     Agreement without the written consent of the other parties.

c.   As previously disclosed to the Trustee, William McKay wishes to purchase
     the Company stock with two other current management employees of the
     Company, so that their combined ownership of the Company will be William
     McKay - 70%, Frank P. Brothers - 15% and Gary S. Horany - 15%.

d.   The lender who will be financing the purchase has requested that its loan
     be made directly to the Company rather than the individual purchasers.

e.   In order to structure the purchase with a loan to the Company, William
     McKay, Frank P. Brothers and Gary S. Horany plan to create a new
     corporation which will actually purchase the stock of the Company and
     simultaneously merge with the Company, leaving the Company as the surviving
     corporation. That would place the loan with the Company as requested by the
     lender, and the Company would be owned 70% by William McKay, 15% by Frank
     P. Brothers and 15% by Gary S. Horany.

                                       1
<PAGE>

     f.   Accordingly, William McKay wishes to assign his right to purchase all
          of the stock of the Company to the new corporation to be formed under
          the name "McKay, Brothers & Horany Acquisition Corp.," the shares of
          which will be owned 70% by William McKay, 15% by Frank P. Brothers and
          15% by Gary S. Horany.

     g.   The Company, Sunbase Asia, Inc. and Samuel T. Mok, Trustee, wish to
          consent to that assignment.

     ACCORDINGLY:

     William McKay hereby assigns to McKay, Brothers & Horany Acquisition
Corp., a corporation owned 70% by William McKay, 15% by Frank P. Brothers and
15% by Gary S. Horany, all of his right, title and interest in and to the
Agreement, including all of his duties, obligations and responsibilities
thereunder. William McKay acknowledges and agrees that this assignment to McKay,
Brothers & Horany Acquisition Corp. will not relieve him personally of any of
the duties, obligations and responsibilities he has under the Agreement or any
other agreement or guaranty executed in connection therewith.

Dated: March 24, 2000                    /s/ William McKay
                                         -----------------------------
                                         William McKay

                           ACCEPTANCE OF ASSIGNMENT

     On behalf of McKay, Brothers & Horany Acquisition Corp., we hereby accept
this assignment and agree to be bound by all of the duties, obligations and
responsibilities of the purchaser under the Agreement.

Dated: March 24, 2000                   /s/ William McKay
                                        ------------------------------
                                        William McKay

                                       2
<PAGE>

Dated March 24, 2000                    /s/ Frank P. Brothers
                                        ______________________________
                                        Frank P. Brothers

Dated March 24, 2000                /s/ Gary S. Horany
                                        ______________________________
                                        Gary S. Horany

                             CONSENT TO ASSIGNMENT

     We hereby consent to the above assignment.

                                          Smith Acquisition Company, Inc.
                                          d/b/a Southwest Products Company, Inc.

Dated: March 24, 2000                     /s/ Samuel T. Mok
                                          ---------------------------------
                                          Samuel T. Mok, Chairman

                                          Sunbase Asia, Inc.

Dated: March 27, 2000                     /s/ Li Yuen Fai (Roger)
                                          ---------------------------------
                                          Li Yuen Fai (Roger), Chief Fin'l
                                          Officer

Dated: March 24, 2000                     /s/ Samuel T. Mok
                                          ---------------------------------
                                          Samuel T. Mok, Trustee

                                       3<PAGE>

                                                                   Exhibit 10.29

                  McKay, Brothers & Horany Acquisition Corp.
                               2240 Buena Vista
                              Irwindale, CA 91706

                                 April 10, 2000

BY TELECOPY
-----------

Sunbase Asia, Inc.
Samuel T. Mok
c/o Samuel T. Mok., Voting Trustee
1001 Connecticut Avenue, N.W.
Suite 1035
Washington, D.C. 20036
Attention: Samuel T. Mok

Gentlemen:

     Reference is made to that certain Stock Purchase Agreement dated January
31, 2000, by and among Smith Acquisition Company D/b/a Southwest Products
Company, Inc., (the "Company"), Samuel T. Mok, as voting trustee, Sunbase Asia,
                     -------
Inc., and William McKay (William McKay, together with his assignee, McKay,
Brothers & Horany Acquisition Corp., the "Buyer"), as amended by a letter
                                          -----
agreement dated February 10, 2000 (the "Stock Purchase Agreement").
                                        ------------------------

     This letter agreement constitutes a second amendment to the Stock Purchase
Agreement. The parties have agreed to extend the expiration date of the Stock
Purchase Agreement to April 28, 2000, to increase by $300,000 the amount of
earnest money deposited into escrow and to certain other changes as set forth
below.

     The Stock Purchase Agreement is amended as follows:

     1.   Section 1.2(a) is amended to read as follows:

          1.2  Time and Place of Closing.

               (a)  The closing of the transactions contemplated hereby (the
     "Closing") will take place on April 28, 2000, or such earlier date as the
      -------
     parties may agree in writing (the "Closing Date"). The Closing shall be
                                        ------------
     held at the offices of Jenkens & Gilchrist, 1919 Pennsylvania Ave., N.W.,
     Suite 600, Washington, D.C. 20006, or such location(s) as may be agreed
     upon by the parties.
<PAGE>

Sunbase Asia, Inc.
Samuel T. Mok
April 10, 2000
Page 2

     2.   Section 2.1 is amended to read as follows:

          2.1  Purchase Price. The aggregate purchase price for the Company
     Shares shall be Three Million Five Hundred Thousand United States Dollars
     (US $3,500,000) (the "Purchase Price"). Buyer shall deliver to the Voting
                           --------------
     Trustee as earnest money, the aggregate amount of Four Hundred Thousand
     United States Dollars (US $400,000) as follows: (a) on the date of this
     Agreement, the amount of One Hundred Thousand United States Dollars (US
     $100,000), (b) on or prior to April 14, 2000, the amount of Two Hundred
     Thousand United States Dollars (US $200,000), and (c) on or prior to April
     19, 2000, the amount of One Hundred Thousand United States Dollars (US
     $100,000). At Closing, the earnest money shall be offset against the
     Purchase Price, the balance of which shall be delivered by Buyer to Seller
     at Closing by wire transfer in immediately available federal funds to an
     account designated by Seller by written notice to Buyer given at least two
     days prior to the Closing Date.

     3.   Section 4.6 is amended to read as follows:

          4.6  Absence of Obligations. Except as set forth on Schedule 4.6
     hereto, Seller has not executed any agreement creating any obligation for
     the Company (other than those obligations addressed in Section 7.9 or
     Section 3.6).

     4.   The first sentence of Section 7.7 is amended to read as follows:

          In the event that Buyer shall fail to close the purchase of the
     Company for any reason other than a breach of this Agreement by Seller or
     the fact that a condition to Buyer's obligations to close set forth in
     Section 8.1 or Section 8.2 shall not have been satisfied, Seller shall be
     entitled to keep the $400,000 earnest money and Buyer shall promptly pay
     Seller the additional amount of $600,000.

     5.   A new Section 7.9 is added to read as follows:

          7.9  Payment of Certain Obligations. At or prior to Closing, the
               ------------------------------
     obligations of the Company to the Jenkens & Gilchrist and Oppenheimer,
     Wolff, Donnelly and Bayh shall have been paid in full by the Company. In
     the event that
<PAGE>

Sunbase Asia, Inc.
Samuel T. Mok
April 10, 2000
Page 3

     the Company has not paid such amounts to Jenkens & Gilchrist and
     Oppenheimer, Wolff, Donnelly and Bayh, Buyer shall pay such amounts at or
     prior to Closing on behalf of the Company. Buyer acknowledges that the
     Company shall have the obligation to pay amounts owing to the United States
     offices of Ernst & Young. At or prior to the Closing, the Company shall pay
     $10,000 for legal fees and expenses of O'Melveny & Myers LLP incurred in
     connection with the Closing of this Agreement. In the event that the
     Company has not paid such amount to O'Melveny & Myers LLP, Buyer shall pay
     such amounts at or prior to Closing on behalf of the Company. Seller shall
     be responsible to pay all amounts owing to the Trustee through April 28,
     2000. In the event the Closing occurs after May 1, 2000, the Company shall,
     at or prior to Closing, pay the Trustee the additional amount of $33,666
     due to the Trustee under the compensation agreement relating to the Voting
     Trust. In the event that the Company has not paid such amount to the
     Trustee, Buyer shall pay such amounts at or prior to Closing on behalf of
     the Company. Notwithstanding the prior two sentences, Seller shall have no
     obligation to extend this Agreement past the date April 28, 2000. In the
     event the Company does not or cannot pay the obligations specified to be
     paid by the Company in this Section 7.9, such failure of payment shall not
     constitute a breach of this Agreement or otherwise limit Buyer's obligation
     under this Agreement and the Buyer shall pay such amounts as specified
     above.

     6.   The first sentence of Section 8.2(f) is deleted so that Section 8.2(f)
reads in its entirety as follows:

          (f)  Certain Obligations. The Company shall have been released from
               -------------------
     any obligations to Seller (including any amounts owing as intercompany
     loans or capital investment) and to Seller's debenture holders, such
     release is to be effective upon the debenture holders' receipt of
     immediately available funds in the amount of U.S.$2.6 million at Closing.
<PAGE>

Sunbase Asia, Inc.
Samuel T. Mok
April 10, 2000
Page 4

     Please indicate your agreement with the foregoing by signing this letter
agreement below, whereupon the Stock Purchase Agreement shall be amended as
provided herein.

                                     BUYER:

                                     MCKAY, BROTHERS & HORANY
                                     ACQUISITION CORP.

                                     By: /s/ William Reed McKay
                                        ------------------------------
                                     Print Name: William Reed McKay
                                                 ---------------------

                                     GUARANTOR:

                                     WILLIAM MCKAY

                                     /s/ William McKay
                                     ---------------------------------

Agreed and Accepted:

SMITH ACQUISITION COMPANY D/B/A
SOUTHWEST PRODUCTS COMPANY, INC.

By: /s/ Samuel T. Mok
    ------------------------

Name: Samuel T. Mok
     -----------------------

Title: Chairman
       ---------------------
<PAGE>

Sunbase Asia, Inc.
Samuel T. Mok
April 10, 2000
Page 5

     SAMUEL T. MOK
     Voting Trustee

     By:  /s/ Samuel T. Mok
          -----------------------------

     Print Name: Samuel T. Mok
                -----------------------

     SUNBASE ASIA, INC.

     By:   /s/ Roger Li
           ----------------------------
     Name: ROGER LI
           ----------------------------
     Title: CHIEF FINANCIAL OFFICER
           ----------------------------

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00009-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00009-of-00352.parquet"}], [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00009-of-00352.parquet"}]]