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Repairing the Bottom of a Bifold Door They're a great method to save space, but can be frustrating when they begin to sag and scratch the floor. These problems are easily fixable by making a few minor adjustments. If your bifold doors scrape on the floor, this is most likely due to a broken track or worn roller. The solution is to replace the damaged rollers. Bottom pivot Over time, the bottom pivot of a bifold door may be loosened or even fall off. This is usually due to a damaged or damaged wood piece on which the pivot pin and anchor sit. If you're exp