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How to Repair a Bifold Door Top Pivot The top pivot could become loose and scrape the floor. This can be corrected by loosening the screw that holds the top bracket. The top pivot pin is made of a metal screw which fits into a cap made of plastic that has a rounded edging and remains in the track above the front door. You'll also need a screwdriver, or perhaps a pair pliers. Remove the Bottom Pin Bifold doors are ideal for maximizing space in closets but they ma