There's rubber inside a balancer right? All the original rubber on these trucks is hard as a rock anyway.
I thought that as well until I drilled out the rivets holding a 1953 235 damper together. The rubber appeared and felt like it was brand new. I don't know what they used in 1953, but it held up surprisingly well.
That particular damper somehow developed a bad wobble. Maybe I dropped it during the rebuild. Once you drop one on the concrete in a very particular way, the rivets shift, causing the rubber to compress on one side, causing it to wobble.
I drilled out all of the rivets and installed 10mm bolts and nuts though all of the parts and carefully tightened them progressively to a specific final torque value. The holes which I drilled just happened to make for a very snug fit for the 10mm bolts. I then installed it to the engine and started it up and the wobble was gone.
