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How to Repair a Bifold Door Top Pivot A bifold closet door's top pivot could become loose and scrape along the floor. You can correct this by loosening the set screw on the top bracket. The top pivot pin is made of an iron screw that fits into a cap made of plastic which has a rounded edging and is positioned above the front door. You'll also need a screwdriver, or perhaps a pair pliers. Take off the pin at the bottom. Bifold doors are great for saving space in a closet, but they can start to s