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Repairing the Bottom of a Bifold Door Bifold doors are fantastic for saving space however they can be troublesome if they start to sag or scrape against the floor. These problems are easily fixable with a few simple changes. If your bifold doors are scraping on the floor, it could be due to a damaged track or worn roller. The damaged rollers need to be replaced. Bottom pivot In time the pivot at the bottom of a bifold door can become loose or even fall out. This is usually due to cracks or a brok