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How to Repair a Bifold Door Top Pivot A bifold closet door's top pivot may become loose and scrape along the floor. You can correct this by loosening the set screw on the top bracket a bit. The top pivot pin is made of 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 require an screwdriver and perhaps a pair pliers. Take off the pin at the bottom. Bifold doors