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Repairing the Bottom of a Bifold Door They are a great way to save space, but can be a pain when they begin to sag and scrape the floor. These issues can be easily solved by making a few small 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 As time passes the pivot pin at the bottom of a bifold door may loosen or even fall out. This is often due to a broken or cracked piece of