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Repairing the Bottom of a Bifold Door They are a great way to save space, but can be frustrating when they begin to sag and scratch the floor. The good part is that these issues are usually easy to fix with a few simple adjustments. If your bifold door is rubbing against the floor, it's likely due to a damaged roller or a worn track. The damaged rollers should be replaced. Bottom pivot Over time the bottom pivot can become loose or even fall off. This usually happens caused by cracks or