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How to Repair a Bifold Door Top Pivot The top pivot of bifold doors can become loose and scrape the floor. This can be fixed by loosening the set screw for the top bracket a bit. is made of a screw made of metal that is inserted into a plastic cap that has a rounded end and remains in the track above the front door. You'll need a screwdriver, and perhaps pliers. Remove the Bottom Pin Bifold doors are great for maximizing space in closets, but they can start to sag or scrape against the floor or fall out of the