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Repairing the Bottom of a Bifold Door Bifold doors are great space-savers however, they can be a hassle if they start to sag or scratch against the floor. The good thing is that these issues are usually fixable with a few simple adjustments. If your bifold door is scraping against the floor, it's probably due to a damaged roller or a worn track. The solution is to replace the damaged rollers. Bottom pivot In time the pivot pin at the bottom of a bifold door can be loosened or ev