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Repairing the Bottom of a Bifold Door They're a great way to reduce space, but they can be a hassle when they begin to sag and scratch the floor. The good news is that these problems are usually fixable with a few simple adjustments. If are scratching on the floor, it could be due to a broken track or worn roller. The damaged rollers should be replaced. Bottom pivot In time the bottom pivot can become loose or even be able to fall off. This is o