STIHL Genuine 064, early 066 Crankshaft #1122 030 0407

Genuine 064 and early 066 narrow case style crankshaft with the M8 Flywheel nut
There are a great many people who are quite crazy about these saws. The Crankshaft is really the heart of the motor so if you want the best for your saw, this part could be what you're needing