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Repairing the Bottom of a Bifold Door They're a great method to save space, but can be a pain when they begin to lose their grip and scratch the floor. These problems can be easily fixed by making a few small adjustments. If your bifold doors are scratching on the floor, this is most likely because of a damaged track or worn roller. The damaged rollers need to be replaced. Bottom pivot In time the pivot at the bottom of a bifold door may be loosened or even fall off. This is typically caused by a cracked or broke