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How to Repair a Bifold Door Top Pivot The top pivot can become loose and scrape along the floor. This can be fixed by loosening the screw that holds the top bracket. The top pivot pin is made of a screw made of metal that is inserted into a plastic cap that has a rounded edging and is positioned above the front door. You'll also need a screwdriver, or perhaps a pair pliers. Take the Bottom Pin off Bifold doors are great