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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 start to slide and scrape the floor. The good thing is that these issues are usually easy to fix with a few simple adjustments. If your bifold door is rubbing against the floor, it's probably due to a broken track or a worn roller. The damaged rollers must be replaced. Bottom pivot In time the pivot pin at the bottom of a bifold door can become loose or even fall out. This is