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How to Repair Bifold Door Top Roller Guide If your bifold doors are sticking, they probably require some maintenance. You may have to clean, lubricate 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 need to restore your bi-fold wardrobe door system to its best performance. Take the door off It may seem complicated and difficult to install an internal set of bifold doors however for those who are DIYe