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Repairing the Bottom of a Bifold Door They're a great method to save space, but they can be frustrating when they begin to sag and scratch the floor. These issues can be easily fixed by making a few small adjustments. If your bifold doors are scratching on the floor, it is likely due to a broken track or worn roller. The solution is to replace the damaged rollers. Bottom pivot As time passes, a bifolding door's bottom pivot can loosen or even d