We're excited and proud to launch Thingiverse Apps. Learn More about what this means to you.
This is a thumb wheel (thumb hexagon?) for the crankshaft to allow easy rotating of the engine assembly by hand. It should be super easy to print.
Crankshaft that fits this hand crank is found here:
Hand Crank for Complete Engine with Rotating Assembly by admica is licensed under the Creative Commons - Attribution license.
So what's this mean?
We're sure admica would love to see what you've printed - take a photo and share it on Thingiverse as a Make.
To post a Make simply visit this Thing again and click I Made One to start uploading your photo. You can also download the Thingiverse Mobile app (available via Google Play and Apple App Store) to take a photo and upload your Make right from the app!