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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 screw that holds the top bracket. The top pivot pin is a metal screw that is fitted into a cap made of plastic with a lipped end that stays within the track, above the door. You'll also require a screwdriver, and possibly a pair pliers. Remove the Bottom Pin The bifold doors can be a great option to make space in your closet, but in time, they can begin to sag against the floor, or fall out