Found out the lawnmower engine is Tecumseh. Does anyone know if Tecumseh used forged steel or iron for their crankshafts? I'm reading that forged steel is the better candidate for straightening, while ductile cast iron might break and cause the blades to go flying at over 200 MPH!!!

Briggs and Stratton began using ductile cast iron for their crankshafts and advised all dealers to stop straightening crankshafts due to safety concerns.