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Repairing the Bottom of a Bifold Door They're a great method to save space, but they can be a pain when they begin to sag and scrape the floor. These issues can be easily fixed with a few simple changes. If your bifold door is scraping against the floor, it's likely due to a broken track or a worn roller. The solution is to replace the damaged rollers. Bottom pivot As time passes, the bottom pivot of a bifold door can become loose or even fall out. This is typically