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Repairing the Bottom of a Bifold Door They're a great way to reduce space, but they can be frustrating when they begin to lose their grip and scrape the floor. These problems can be easily solved by making a few minor adjustments. If your bifold door is rubbing against the floor, it's most likely due to a damaged track or a worn roller. The damaged rollers should be replaced. As time passes the bottom pivot can become loose or even be able to fall off. This is usually due to a broken or cracked piece of woo