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How to Repair a Bifold Door Top Pivot The top pivot of bifold doors can be loosened and scrape the floor. This can be fixed by loosening the set screw for the top bracket a bit. The top pivot pin is a metal screw which fits into a plastic cap that has a rounded top and stays in the track above the front door. You'll also need an screwdriver and perhaps two pliers. Take off the Bottom Pin Bifold doors are ideal for saving space in closets, but they can start to buckle or scrape the floor or fall out of the