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How to Repair a Bifold Door Top Pivot The top pivot can become loose and scrape the floor. It is possible to fix 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 within the track, above the door. You'll require a screwdriver and possibly a pair of pliers. Take off the Bottom Pin Bifold doors are great to save space in closets however, they can begin to buckle or scrape th