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How to Repair a Bifold Door Top Pivot The top pivot of a bifold closet door can become loose and scratch the floor. You can correct this by loosening the set screw for the top bracket slightly. The top pivot pin is an iron screw that fits into a cap made of plastic which has a rounded edging and stays in the track above the front door. You'll also require a screwdriver, or perhaps an assortment of pliers. Remove the bottom pin Bifold doors are ideal for maximizing space in closets but they may begin to slide o