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How to Repair a Bifold Door Top Pivot The top pivot of a bifold closet door can become loose and scratch the floor. This can be fixed by loosening the set screw for 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 remains in the track above the front door. You'll need a screwdriver and perhaps pliers. Remove the bottom pin Bifold doors are an excelle