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How to Repair a Bifold Door Top Pivot The top pivot of bifold doors can become loose and scrape the floor. This can be fixed by loosening the set screw for the top bracket. The top pivot pin is a metal screw which fits into a plastic cap that has a rounded edging and stays in the track above the front door. You'll need a screwdriver, and perhaps pliers. Take off the pin at the bottom. Bi