They are easy to identify = there is a huge amount of Side weight present on the Balancer.
Out of the Millions ( I think 8,000,000 of 383 ) I believe that well less than one in a hundred
had the cast crank so the are not real common. I am not sure they had the same Design and
Diameter on the snout. I have not seen one for 40 years.
I agree, they are remarkably different. But the OP says he has a bad vibration. I don't believe the small amount of metal removed from that neutral balancer is enough to cause a bad vibration. I could be wrong. It's happened a lot. lol
