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How to Repair a Bifold Door Top Pivot The top pivot of bifold doors can become loose and scratch the floor. This can be corrected by loosening up the screw that holds the top bracket. The top pivot pin is a screw made of metal that is inserted into a plastic cap that has a rounded top and stays in the track above the front door. You'll also need 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 slide against the floor, or fall out of the bra