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Repairing the Bottom of a Bifold Door Bifold doors are great space-savers however they can be frustrating when they begin to bow or scratch against the floor. The good part is that these issues are often easy to fix by making a few minor adjustments. If your bifold doors are scratching on the floor, it is likely due to a damaged track or worn roller. The solution is to replace the damaged rollers. Bottom pivot As time passes, a bifolding door's bottom pivot can become loose or even fall off.