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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 fixed by loosening up the set screw on the top bracket. The pivot pin on the top is a metal screw that fits into a plastic cap with a lipped end that stays in the track just above the door. You'll also need an screwdriver and perhaps an assortment of pliers. Remove the Bottom Pin Bifold doors are ideal for saving space in closets but they may begin to slide or scratch against