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Repairing the Bottom of a Bifold Door They're a great way to save space, but they can be frustrating when they begin to lose their grip and scratch the floor. The good news is that these problems are often easy to fix with a few simple adjustments. If your bifold door is scraping against the floor, it's probably due to a damaged track or a worn roller. The damaged rollers need to be replaced. Bottom pivot As time passes, the bottom pivot of a bifold door may loosen or even fall out. This can be caused by