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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 slide or scratch against the floor. The good news is that these problems are often easy to fix with a few simple adjustments. If your bifold doors are scratching on the floor, this is likely because of a damaged track or worn roller. The damaged rollers must be replaced. Bottom pivot As time passes, a bifolding door's bottom pivot can loosen or even be able to fall off. This can be