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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 corrected by loosening up the screw that holds the top bracket. The top pivot pin is made of an iron screw that fits into a cap made of plastic that has a rounded edging and is positioned above the front door. You'll need a screwdriver, and perhaps pliers. Remove the Bottom Pin Bifold doors are great for maximizing space in closets but they may begin to sag or scrape against