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How to Repair a Bifold Door Top Pivot The top pivot could become loose and scrape the floor. This can be fixed by loosening the set screw on the top bracket. The top pivot pin is a screw made from metal that is inserted into a cap made of plastic with a lipped end that stays in the track just above the door. You'll also need a screwdriver, or perhaps two pliers. Remove the bottom pin Bifold doors are ideal for maximizing space