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Repairing the Bottom of a Bifold Door They're a great way to save space, but can be a pain when they begin to sag and scratch the floor. These issues can be easily solved by making a few small adjustments. If your bifold doors are scraping on the floor, it could be because of a damaged track or worn roller. The solution is to replace the damaged rollers. Bottom pivot In time the pivot pin at the bottom of a bifold door may loosen or even fall out. This can be caused by