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Repairing the Bottom of a Bifold Door They're a great way to save space, but can be frustrating when they begin to sag and scrape the floor. The good news is that these problems are usually easy to fix with a few simple 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 solution is to replace the damaged rollers. Bottom pivot Over time the pivot pin at the bottom of a bifold door could become loose or even fa