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How to Repair a Bifold Door Top Pivot The top pivot of the bifold closet door could be loosened and scrape the floor. This can be fixed by loosening the set screw of the top bracket a bit. The top pivot pin is an iron screw that fits into a cap made of plastic that has a rounded top and stays in the track above the front door. You'll also need an screwdriver and perhaps a pair pliers. Take off the pin at the bottom. Bifold doors are great for saving space in