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How to Repair a Bifold Door Top Pivot A bifold closet door's top pivot could be loosened and scrape the floor. This can be fixed by loosening the set screw of the top bracket slightly. The pivot pin on the top is a metal screw that fits into a plastic cap that has a lipped end that stays within the track, above the door. You'll require a screwdriver and perhaps pliers. Take the Bottom Pin off Bifold doors are ideal to save space in closets, but they can start to slide or scratch against the floor, or even pop out