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How to Repair a Bifold Door Top Pivot The top pivot could be loosened and scrape the floor. This can be fixed by loosening the set screw of the top bracket. The pivot pin on the top is a screw made from metal that is fitted into a plastic cap that has a lipped end that stays within the track, above the door. You'll require a screwdriver and perhaps pliers. Take off the Bottom Pin Bifold doors are great for saving space in closets but they may begin to buckle or scrape the floor or fall out of their b