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Repairing the Bottom of a Bifold Door Bifold doors can be great for saving space, but they can be troublesome when they begin to slide or scrape against the floor. These issues can be easily solved by making a few small adjustments. If your bifold door is scratching the floor, it's probably due to a damaged track or roller that is worn out. The solution is to replace the damaged rollers. Bottom pivot In time the pivot pin at the bottom of a bifold door can become loose or even fall out. T