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Repairing the Bottom of a Bifold Door Bifold doors can be great for saving space, but they can be a hassle when they begin to slide or scratch against the floor. These problems can be easily solved with a few simple changes. If your bifold doors are scratching on the floor, it is likely due to a broken track or worn roller. The damaged rollers should be replaced. Bottom pivot In time, a bifolding door's bottom pivot can loosen or even fall off. This can be due to a broken or damaged wood piece on which t