Crankshaft balancing machine.
<video controls autoplay loop>
<source src="https://s3-us-west-1.amazonaws.com/hmt-forum/crankshaft_balancing_machine.mp4" type="video/mp4">
Your browser does not support the video tag.
</video>
Previously:
https://www.homemadetools.net/forum/...0885#post73315
https://www.homemadetools.net/forum/...1800#post94762
https://www.homemadetools.net/forum/...175#post130455