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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. can correct this by loosening the set screw on the top bracket a bit. The pivot pin on the top is a screw made of metal that is fitted into a plastic cap with an end that is lipped and stays inside the track above the door. You'll also need a screwdriver, or perhaps a pair pliers. Remove the bottom pin The bifold doors can be an excellent way to save space