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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 top pivot pin is made of an iron screw that fits into a plastic cap that has a rounded edging and remains in the track above the front door. You'll need a screwdriver, and possibly pliers. Take the Bottom Pin off Bifold doors are an excellent option to make space in your closet, however