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How to Repair a Bifold Door Top Pivot The top pivot of the bifold closet door could become loose and scrape the floor. This can be corrected by loosening the screw that holds the top bracket. The pivot pin on the top is a screw made of metal that is inserted into a cap made of plastic with an end that is lipped and stays inside the track above the door. You'll also need a screwdriver, and possibly a pair pliers. Remove the Bottom Pin Bifold doors are ideal for saving space in closets however, they can begin to buckl