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How to Repair a Bifold Door Top Pivot A bifold closet door's top pivot could become loose and scrape along the floor. This can be fixed by loosening the set screw on the top bracket. The top pivot pin is a metal screw that fits into a plastic cap with an lipped end that is inside the track above the door. You'll need a screwdriver and possibly pliers. Take off the Bottom Pin Bifold doors are ideal for maximizing space in a closet, but they can start to slide or scratch against the floor, or even pop out