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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 slide or scrape against the floor. These problems can be easily fixed with a few simple changes. If your bifold door is scraping against the floor, it's most likely due to a damaged track or a worn roller. The damaged rollers must be replaced. Bottom pivot In time the pivot pin at the bottom of a bifold door can loosen or even fall out. This is usually caused