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How to Repair a Bifold Door Top Pivot A bifold closet door's top pivot could become loose and scrape the floor. You can correct this by loosening the set screw on the top bracket. The pivot pin on the top is a metal screw that is fitted into a cap made of plastic with an lipped end that is in the track just above the door. You'll require a screwdriver and perhaps pliers. Take off the pin at the bottom. Bifold doors are ideal for maximizing space in a closet however, they can begin to sag or s