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Prospectus Supplement Dated August 31, 2006 to                         Filed Pursuant to Rule 424(b)(3)
Prospectus Dated August 17, 2006                                                    File No. 333-126659





                              RIVIERA TOOL COMPANY

                        3,256,791 Shares of Common Stock
                                 (No Par Value)

         On August 31, 2006, Riviera Tool Company entered into an Omnibus
Amendment with Laurus Master Fund, Ltd. ("Laurus"), amending the term "Fixed
Conversion Price" with respect to the Convertible Term Note (the "Term Note"),
dated as of May 17, 2005, by Riviera Tool in favor of Laurus in the aggregate
principal amount of $3,200,000 issued pursuant to the terms of the Securities
Purchase Agreement, dated as of May 17, 2005, between Riviera Tool and Laurus.
The term "Fixed Conversion Price," with respect solely to the Term Note, was
amended as follows:

           The initial Fixed Conversion Price means $1.66; provided,
           however, that in respect of the first $50,000 of aggregate
           principal amount (the "Initial Converted Amount") of the Term
           Note converted into shares of our common stock, the Fixed
           Conversion Price in respect of such Initial Converted Amount
           (and the interest and fees associated therewith to the extent
           converted) shall be equal to $0.35.

         For purposes of this prospectus supplement and the related prospectus,
any references to "Fixed Conversion Price" shall be amended as described above.