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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. is possible to fix this by loosening the set screw of the top bracket slightly. The top pivot pin is a metal screw which fits into a plastic cap that has a rounded end and remains in the track above the front door. You'll need a screwdriver and perhaps pliers. Remove the bottom pin Bifold doors are ideal for saving space in a closet however, they can begin to sag or scrape against th