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Repairing the Bottom of a Bifold Door Bifold doors are great space-savers however they can be frustrating when they begin to bow or scratch against the floor. These problems are easily fixable with a few simple changes. If your bifold door is scratching the floor, it's probably due to a broken roller or a worn track. The damaged rollers should be replaced. Bottom pivot In time the bottom pivot can loosen or even drop off. This is usually due to a damaged or damaged wood piece on which the pivot