How to Repair Bifold Door Top Roller Guide If your bifold door is sticking, it's likely that they require some maintenance. You may need to clean, lubricate or adjust them. The issue could be caused by an unfastened bolt on the top pivot or by the top guide roller. This https://bifoldingdoorrepair44432.ageeksblog.com/29927388/why-nobody-cares-about-bi-fold-door-repairs