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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. This can be fixed by loosening up the set screw on the top bracket. The top pivot pin is a metal screw that is fitted into a plastic cap with an end that is lipped and stays inside the track above the door. You'll also need a screwdriver, and possibly two pliers. Remove the bottom pin Bifold doors are great for maximizing space in a closet, but they can start to sag or scrape against the floor or f