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How to Repair a Bifold Door Top Pivot The top pivot may become loose and scrape along the floor. This can be corrected by loosening up the set screw on the top bracket. The top pivot pin is a screw made of metal that fits into a cap made of plastic with a lipped end that stays in the track just above the door. You'll also need a screwdriver, or perhaps two pliers. Take the Bottom Pin off Bifold doors are the ideal option to maximize space in your closet, but over time they may start to sag against the floor, or even fall out of the brackets. The good