EXHIBIT 3.1.21

                            CERTIFICATE OF AMENDMENT
                                     TO THE
                            CERTIFICATE OF FORMATION
                                       OF
                                  SCI/TAG, LLC

         THIS AMENDMENT to the Certificate of Formation of SCI/TAG, LLC (the
"Company") is being executed and filed by the undersigned to amend the
Certificate of Formation of the Company under Section 18-202 of the Delaware
Limited Liability Company Act.

         1.       The name of the Company is SCI/TAG, LLC.

         2.       Article I of the Certificate of Formation is hereby amended to
                  read:

                  "I. Name. The name of the limited liability company is SCI
                  ENCLOSURES, LLC."

         3.       This Certificate of Formation shall be effective upon the date
                  and time filed with the Secretary of State.

         IN WITNESS WHEREOF, the undersigned Manager has caused this Certificate
of Amendment to be executed as of this 16th day of May, 2001.

                                    SCI/TAG, LLC

                                    By: /s/ George J. King
                                        -------------------------------------

                                    Name: George J. King

                                    Title: Manager