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How to Repair a Bifold Door Top Pivot The top pivot of a bifold closet door can be loosened and scrape the floor. This can be corrected by loosening the set screw on the top bracket. The top pivot pin is a screw made of metal that is inserted into a cap made of plastic that has a rounded top and stays in the track above the front door. You'll need a screwdriver, and possibly pliers. Take off the pin