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Repairing the Bottom of a Bifold Door Bifold doors can be great for saving space, but they can be frustrating when they begin to bow or scratch against the floor. The good news is that these problems are usually fixable with a few simple adjustments. If your bifold door is rubbing against the floor, it's most likely due to a broken roller or a worn track. The solution is to replace the damaged rollers. Bottom pivot In time the pivot at the bottom of a bifold door can become loose or even