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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 set screw on the top bracket. The top pivot pin is made of an iron screw that fits into a cap made of plastic that has a rounded top and is positioned above the front door. You'll need a screwdriver, and possibly pliers. Take off the pin at the bottom. Bifold doors are the ideal way to save space in your closet, but as time passes, they could begin to fall off the floor, or break off from brackets. There are sol