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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 corrected by loosening up 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 edging and is positioned above the front door. You'll need a screwdriver, and possibly a pair of pliers. Remove the bottom pin Bifold doors can be a great way to save space in your closet, but over time they may start to fall off the floor,