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Repairing the Bottom of a Bifold Door Bifold doors are great space-savers, but they can be a hassle when they begin to bow or scrape against the floor. These problems can be easily solved with a few simple changes. If your bifold doors are scratching on the floor, this is most likely due to a damaged track or worn roller. The solution is to replace the damaged rollers. Bottom pivot In time the pivot pin at the bottom of a bifold door may be loosened or even fall off. This usually happens due to cracks or br