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How to Repair a Bifold Door Top Pivot A bifold closet door's top pivot could become loose and scrape along the floor. This can be fixed by loosening the set screw of the top bracket slightly. The top pivot pin is a metal screw which fits into a cap made of plastic that has a rounded end and remains in the track above the front door. You'll also need an screwdriver and perhaps an assortment of pliers. Take off the Bottom Pin Bifold doors are the ideal opti