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Repairing Bifold Doors The hardware that holds the bifold doors together will deteriorate over time. Cleaning and lubricating all the mechanisms (including the lock) can keep them working smoothly and efficiently. Most of the time, the issue can be solved easily. This guide will show you how to repair your bifold doors when they become difficult to open or close. Cracked Pivot Pins A bifold door is made up of a pair of panels that slide on tracks that are that is installed i