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Repairing the Bottom of a Bifold Door They are a great way to save space, but they can be frustrating when they begin to sag and scratch the floor. The good part is that these issues are usually easy to fix with a few simple adjustments. If your bifold door is scratching the floor, it's probably due to a damaged track or a worn roller. The solution is to replace the damaged rollers. Bottom pivot As time passes the bottom pivot can become loose or even drop off. This usually happens caused by a cracked or