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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. This can be fixed by loosening the set screw on the top bracket. The top pivot pin is a metal screw that fits into a cap made of plastic 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 pin at the bottom. Bifold doors can be an excellent option to maximize space in your closet, but in time, the