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How to Repair a Bifold Door Top Pivot The top pivot could become loose and scrape the floor. This can be fixed by loosening the set screw on the top bracket. The top pivot pin is made of a metal screw which fits into a cap made of plastic that has a rounded end and remains in the track above the front door. You'll also need a screwdriver, or perhaps an assortment of pliers. Remove the bottom pin Bifold doors are great to save space in closets, but they can start to slide or scratch against the floor, or e