If there's one thing I've learned in my semi-advanced age is that are many ways to accomplish the same goal. I appreciate that members here share their methodology to help others.
Thanks for sharing
Grant
Agree with alan, sounds like a cast crank damper. Is the crank a cast or forged unit? Although I dont have any numbers here, I would think if it starts with a 3 instead of a 2 it would be later than 1969.
Grant