JOINDER TO REGISTRATION AGREEMENT

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                                                                     Exhibit 4.2

                        JOINDER TO REGISTRATION AGREEMENT

         THIS JOINDER TO REGISTRATION AGREEMENT (this "Joinder") is executed as

of March 28, 2003, by and among Bostrom Holding, Inc., a Delaware corporation

(the "Company"), J2R Partners VI ("J2R"), CVS Partners, LP ("CVS Partners"), and

CVS Executive Investco LLC ("Investco" together with J2R and CVS Partners, the

"New Investors").

         WHEREAS, the Company, Onex Corporation, J2R Partners VII and certain

other stockholders of the Company are party to that certain Registration

Agreement, dated as of October 5, 2000, as amended (the "Registration

Agreement"). Capitalized terms used but not defined herein have the meaning

given to them in the Registration Agreement.

         WHEREAS, the New Investors have acquired shares in the Company pursuant

to that certain Agreement and Plan of Merger, dated even herewith, by and

between the Company, CVS Merger Co., and CVS Holdings, Inc.

         WHEREAS, the Company desires to provide the New Investors rights under

the Registration Agreement as set forth herein.

         NOW, THEREFORE, the parties hereto agree as follows:

         1.        Joinder. The parties hereto agree that, by and upon execution

of this J