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How to Repair Bifold Door Top Roller Guide If your bifold doors are sticking it's likely 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 everything you need to restore your bi-fold wardrobe door system to its best performance. Take the door off Installing a set of internal bifold doors may see