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How to Repair a Bifold Door Top Pivot The top pivot of bifold doors can be loosened and scrape the floor. It is possible to fix this by loosening the set screw of the top bracket. The pivot pin on the top is a screw made of metal that fits into a plastic cap with a lipped end that stays inside the track above the door. You'll need a screwdriver, and possibly a pair of pliers. Take off the Bottom Pin Bifold doors are a great option to make space in your closet, but in time, they can begin to fall o