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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. This can be corrected by loosening up the set screw on the top bracket. The pivot pin on the top is a screw made from metal that fits into a plastic cap that has an lipped end that is inside the track above the door. You'll also require a screwdriver, or perhaps a pair pliers. Take off the Bottom Pin Bifold doors are great for saving space in closets, but they can start