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Repairing the Bottom of a Bifold Door Bifold doors can be great for saving space, but they can be frustrating if they start to sag or scrape against the floor. These problems are easily fixable by making a few small adjustments. If your bifold doors are scraping on the floor, it could be due to a broken track or worn roller. The damaged rollers must be replaced. Bottom pivot As time passes the pivot pin at the bottom of a bifold door could become loose or even fall out. This is usually due to