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How to Repair a Bifold Door Top Pivot The top pivot of a bifold closet door can become loose and scratch 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 that has a rounded edging and remains in the track above the front door. You'll require a screwdriver and perhaps pliers. Take off the Bottom Pin Bifold doors are great for maximizing space in a closet however, they can begin to sag or scrape against the floor or pop out of