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Repairing the Bottom of a Bifold Door They're a great method to save space, but they can be a hassle when they start to slide and scratch the floor. The good news is that these problems are usually fixable by making a few minor adjustments. If your bifold doors are scratching on the floor, this is most likely due to a broken track or worn roller. The damaged rollers should be replaced. Bottom pivot In time the bottom pivot may loosen or even fall off. This is often caused by a damaged or cracked w