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How to Repair a Bifold Door Top Pivot The top pivot could become loose and scrape along the floor. It is possible to fix this by loosening the set screw on the top bracket. The top pivot pin is a metal screw which fits into a cap made of plastic which has a rounded end and stays in the track above the front door. You'll also require an screwdriver and perhaps a pair pliers. Take the Bottom Pin off Bifold doors can be a great option to make space in your closet, however over time they may start to fall of