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How to Repair a Bifold Door Top Pivot The top pivot can be loosened and scrape the floor. This can be corrected by loosening up the set screw on the top bracket. The pivot pin on the top is a metal screw that is inserted into a plastic cap that has an lipped end that is inside the track above the door. You'll also need an screwdriver and perhaps two pliers. Take off the Bottom Pin Bifold doors can be the ideal option to maximize space in your closet, however in time, they can begin to sag agains