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How to Repair a Bifold Door Top Pivot The top pivot can become loose and scrape along the floor. This can be fixed by loosening the set screw for the top bracket slightly. The pivot pin on the top is a screw made of metal that fits into a cap made of plastic with a lipped end that stays in the track just above the door. You'll need a screwdriver and perhaps pliers. Take off the Bottom Pin Bifold doors are great for maximizing space in a closet however, they can begin to buckle or scrape the floor, or ev