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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. You can correct this by loosening the set screw of the top bracket a bit. The pivot pin on the top is a screw made from metal that is inserted into a plastic cap with an lipped end that is inside the track above the door. You'll also need a screwdriver, and possibly a pair pliers. Take the Bottom Pin off Bifold doors are the ideal option to maximize space in your closet, but over time they