Oregon Flywheel Key Fits Husqvarna Fits Craftsman 611004 NEWOne New Aftermarket Replacement Offset Flywheel Key for Tecumseh Engines (Oregon 02 403) This offset flywheel key (woodruff key) aligns the flywheel in the correct position on the crankshaft of Tecumseh small engines used in Fits Husqvarna and Fits Craftsman lawn and garden equipment. Designed for engines with solid state ignition, this sacrificial key is engineered to shear in half if the engine stops suddenly due to impact, protecting the crankshaft