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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 the set screw of the top bracket a bit. The top pivot pin is a metal screw that is fitted into a cap made of plastic with an end that is lipped and stays within the track, above the door. You'll also require a screwdriver, or perhaps two pliers. Remove the Bottom Pin The bifold doors can be an excellent option to make space in your closet, but over time they may start to sag against the floor, or even fall out of the brackets.