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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. The good part is that these issues are usually easy to fix with a few simple adjustments. If your bifold doors are scratching on the floor, it could be 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