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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 bow or scrape against the floor. These problems can be easily solved by making a few small adjustments. If your bifold door is scratching the floor, it's most likely due to a damaged track or roller that is worn out. The damaged rollers need to be replaced. Bottom pivot As time passes the bottom pivot may loosen or even drop off. This is usually due to cracks or break