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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 on the top bracket. The top pivot pin is a screw made of metal that is inserted into a plastic cap that has a rounded top and is positioned above the front door. You'll need a screwdriver and possibly pliers. Remove the Bottom Pin Bifold doors are ideal to save space in closets, but they can start to buckle or scrape the floor or fall out of their brackets. You can fix most pr