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How to Repair a Bifold Door Top Pivot The top pivot could be loosened and scrape the floor. This can be fixed by loosening the set screw on the top bracket. The top pivot pin is an iron screw that fits into a cap made of plastic which has a rounded end and stays in the track above the front door. You'll require a screwdriver and possibly pliers. Take off the pin at the bottom. Bifold doors are a great option to maximize space in your closet, however in time, they can begin to sag against the floor, or pop out of br