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How to Repair a Bifold Door Top Pivot A bifold closet door's top pivot could become loose and scrape the floor. This can be corrected by loosening the set screw on the top bracket. The pivot pin on the top is a screw made from metal that fits into a cap made of plastic with an end that is lipped and stays inside the track above the door. You'll require a screwdriver and possibly pliers. Take off the Bottom Pin Bifold doors are an excellent way to save space in your closet