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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. You can correct this by loosening the set screw for the top bracket slightly. The top pivot pin is made of a metal screw which fits into a cap made of plastic that has a rounded top and is positioned above the front door. You'll also need a screwdriver, or perhaps an assortment of pliers. Remove the bottom pin Bifold doors are ideal for saving space in a closet, but they can start to buckle or scrape the