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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 on the top bracket. on the top is a screw made from metal that is fitted into a plastic cap with an lipped end that is within 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 c