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How to Repair Bifold Door Top Roller Guide If your bifold door is sticking, it's likely that they require some maintenance. You may have to clean and lubricate them or adjust them. The problem could be caused by a loose bolt 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 to its optimal performance. Take the door off Installing an internal set of bifold doors might appear to be a complicated and challenging project however, it's