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How to Repair a Bifold Door Top Pivot The top pivot of bifold doors can become loose and scrape the floor. You can correct this by loosening the set screw for the top bracket. The top pivot pin is a screw made of metal that is fitted into a cap made of plastic with a lipped end that stays in the track just above the door. You'll also require a screwdriver, or perhaps two pliers. Take off the Bottom Pin Bifold doors are an excellent option to make space in your cl