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How to Repair a Bifold Door Top Pivot The top pivot can become loose and scrape the floor. This can be fixed by loosening the set screw on the top bracket. The top pivot pin is a metal screw which fits into a cap made of plastic which has a rounded end and is positioned above the front door. You'll also require an screwdriver and perhaps two pliers. Remove the Bottom Pin Bifold doors are great for saving space in a closet but they may begin to slide or scratch against the floor, or even pop out of their br