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How to Repair Bifold Door Top Roller Guide If your bifold door is squeaking then it's likely that they require some maintenance. It is possible that you need to clean or lubricate them, or even adjust them. The problem could be caused by loose bolts on the top pivot, or by the top guide roller. This kit includes all the hardware you require to restore your bi-fold wardrobe door system to its peak performance. Take the door off It may seem complicated and difficult to install