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How to Repair a Bifold Door Top Pivot The top pivot may become loose and scrape the floor. This can be corrected by loosening the set screw on the top bracket. The pivot pin on the top is a screw made of metal that fits into a plastic cap with an lipped end that is inside the track above the door. You'll also require a screwdriver, and possibly two pliers. Take off the Bottom Pin Bifold doors are great for saving space in a closet but they may begin to buckle or scrape the floor or pop out of their br