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Repairing Bifold Doors The hardware that is used to hold the bifold doors together will wear out over time. Cleaning and lubricating the mechanisms (including the lock) can help keep them working smoothly and efficiently. Most of the time, the issue is a small issue that can be easily fixed. This guide will help you understand how to repair your bifold doors when they become difficult to open or close. Cracked Pivot Pins A bifold door is made up of