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How to Repair a Bifold Door Top Pivot The top pivot can become loose and scrape along the floor. You can correct this by loosening the set screw of the top bracket a bit. The pivot pin on the top is a metal screw that is inserted into a plastic cap with a lipped end that stays within the track, above the door. You'll need a screwdriver and possibly a pair of pliers. Take off the pin at the bottom. Bifold doors are ideal to save space in a closet but they may begin to slide or scratch against the floor, or even