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Repairing the Bottom of a Bifold Door Bifold doors are great space-savers, but they can be troublesome when they begin to slide or scrape against the floor. These problems can be easily fixed by making a few small adjustments. If your bifold doors scrape on the floor, this is likely due to a damaged track or worn roller. The solution is to replace the damaged rollers. Bottom pivot In time, the bottom pivot of a bifold door can be loosened or even fall off. This can be caused by a dam