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How to Repair a Bifold Door Top Pivot The top pivot can be loosened and scrape the floor. You can correct this by loosening the set screw of the top bracket slightly. The top pivot pin is a metal screw which fits into a cap made of plastic that has a rounded end and stays in the track above the front door. You'll require a screwdriver and perhaps pliers. Take off the Bottom Pin Bifold doors are great to save space in a closet, but they can start to slide or scratch against the floor or fall out of their brackets.