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How to Repair a Bifold Door Top Pivot The top pivot can become loose and scrape along the floor. This can be corrected by loosening the set screw on the top bracket. The top pivot pin is a screw made of metal that is inserted into a cap made of plastic which has a rounded top and stays in the track above the front door. 'll also require a screwdriver, or perhaps two pliers. Remove the bottom pin Bifo