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How to Repair a Bifold Door Top Pivot The top pivot of bifold doors can become loose and scratch the floor. It is possible to fix this by loosening the set screw of 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 top and stays in the track above the front door. You'll need a screwdriver, and possibly pliers. Remove the bottom pin Bifold doors are ideal for maximizing space in a closet h