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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 slide or scratch against the floor. These issues are easily fixable by making a few minor adjustments. If your bifold doors are scratching on the floor, this could be due to a broken track or worn roller. The damaged rollers need to be replaced. Bottom pivot Over time the pivot pin at the bottom of a bifold door could loosen or even fall out. This is us