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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 of the top bracket slightly. The top pivot pin is a metal screw that is inserted into a plastic cap that has a lipped end that stays in the track just above the door. You'll need a screwdriver and possibly pliers. Take off the pin at the bottom. Bifold doors can be the ideal option to make space in your closet, but over time t