A-B1690979-AI KEY-WOODRUFFOne New Aftermarket Replacement Woodruff Key Fits Briggs & Fits Stratton Small Engines This aftermarket replacement Woodruff key (also called a crankshaft key or flywheel key) secures the flywheel to the crankshaft on Fits Briggs & Fits Stratton small engines, preventing rotational slippage and ensuring proper ignition timing. The semicircular key seats in the crankshaft keyway and is a common wear and damage item a bent or sheared key will cause the