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How to Repair a Bifold Door Top Pivot The top pivot of the bifold closet door could become loose and scratch the floor. You can correct this by loosening the set screw of the top bracket. The top pivot pin is made of a screw made of metal that is inserted into a cap made of plastic that has a rounded edging and stays in the track above the front door. You'll also need an screwdriver and perhaps two pliers. Take off the pin at the bottom. Bifold doors are ideal for maximizing space in a closet, but they