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How to Repair a Bifold Door Top Pivot The top pivot of the bifold closet door could be loosened and scrape the floor. You can correct this by loosening the set screw of the top bracket a bit. The top pivot pin is a screw made from metal that fits into a cap made of plastic with an end that is lipped and stays in the track just above the door. You'll also need an screwdriver and perhaps an assortme