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Repairing the Bottom of a Bifold Door Bifold doors can be great for saving space however they can be troublesome when they begin to bow or scratch against the floor. These issues can be easily fixed by making a few small adjustments. If your bifold door is scraping against the floor, it's probably due to a damaged roller or a worn track. The damaged rollers need to be replaced. Bottom pivot In time the pivot pin at the bottom of a bifold door may become loose or even fall out. This can be due to a broken or dama