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Repairing the Bottom of a Bifold Door Bifold doors are fantastic for saving space, but they can be a hassle if they start to sag or scratch against the floor. These issues are easily fixable with a few simple changes. If your bifold doors are scratching on the floor, it is likely due to a damaged track or worn roller. The solution is to replace the damaged rollers. Bottom pivot In time, a bifolding door's bottom pivot may loosen or even fall off. This usually happens due to cracks or breaks in the wood