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How to Repair a Bifold Door Top Pivot The top pivot of the bifold closet door could become loose and scrape the floor. This can be fixed by loosening up the set screw on the top bracket. The top pivot pin is made of a screw made of metal that is inserted into a cap made of plastic which has a rounded edging and remains in the track above the front door. You'll also need a screwdriver, and possibly a pair pliers. Take off the Bottom Pin Bifold doors are the ideal option to maximize space i