90741-035-000 Woodruff (3Mm) key - Overview. The 90741-035-000 Woodruff (3Mm) key is a vital component in Honda marine engine systems. This semi-circular metal fastener provides the critical function of securing rotating shafts and hubs, ensuring smooth mechanical motion and reliable engine performance. Designed to match factory specifications and tolerances, it ensures seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. A 3mm Woodruff key des