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How to Repair a Bifold Door Top Pivot The top pivot could be loosened and scrape the floor. You can correct this by loosening the set screw on the top bracket slightly. The top pivot pin is a screw made of metal that is inserted into a plastic cap that has a rounded top and remains in the track above the front door. You'll need a screwdriver and possibly a pair of pliers. Remove the bottom pin Bifold doors are a