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Repairing the Bottom of a Bifold Door Bifold doors are great space-savers however they can be a hassle if they start to sag or scrape against the floor. These issues can be easily solved by making a few small adjustments. If your bifold door is scratching the floor, it's likely due to a damaged roller or a worn track. The solution is to replace the damaged rollers. Bottom pivot In time the pivot pin at the bottom of a bifold door can become loose or even fall out. This is often due to a broken or