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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 corrected by loosening up the set screw on the top bracket. The top pivot pin is made of a screw made of metal that is inserted into a cap made of plastic that has a rounded end and remains in the track above the front door. You'll need a screwdriver and perhaps pliers. Take off the pin at the bottom. Bifold doors are great for maximizing space in a closet however, they can be