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Repairing the Bottom of a Bifold Door Bifold doors are great space-savers, but they can be frustrating when they begin to slide or scrape against the floor. These issues are easily fixable with a few simple changes. If your bifold door is scratching the floor, it's likely due to a damaged track or roller that is worn out. The solution is to replace the damaged rollers. Bottom pivot As time passes the pivot pin at the bottom of a bifold door could loosen or even fall out. This is o