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Repairing are a great feature for your home, but as time passes, the hardware that holds them together can deteriorate. Cleaning and lubricating the mechanism (including the lock) will keep them running smoothly and efficiently. Oft, the problem can be easily solved. This guide will show how to fix your bifold door if it becomes difficult to open or close. Cracked Pivot Pins A bifold door is comprised of two panels that move across a track that runs through the floor and head jambs.