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How to Repair a Bifold Door Top Pivot The top pivot of a bifold closet door can become loose and scrape the floor. This can be fixed by loosening the set screw of the top bracket a bit. The top pivot pin is a screw made from metal that is inserted into a plastic cap that has an end that is lipped and stays inside the track above the door. You'll also require a screwdriver, or perhaps an assortment of pliers. Remove the Bottom Pin Bifold doors are g