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Repairing the Bottom of a Bifold Door They are a great way to save space, but can be a hassle when they begin to sag and scratch the floor. These problems can be easily solved by making a few minor adjustments. If your bifold doors are scraping on the floor, it is most likely due to a broken track or worn roller. The solution is to replace the damaged rollers. Bottom pivot Over time, the bottom pivot of a bifold door could become loose or even fall out. This is often due to a broke