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How to Repair a Bifold Door Top Pivot A bifold closet door's top pivot may become loose and scrape the floor. It is possible to fix this by loosening the set screw of the top bracket slightly. The pivot pin on the top is a screw made from metal that is inserted into a plastic cap with an end that is lipped and stays in the track just above the door. You'll also need a screwdriver, and possibly a pair pliers. Take off the Bottom Pin Bifold doors are great for savin