Pulled the CAS and discovered the end(pin) broke off. When I reinstalled it, I could tell it was hanging up and kept tweaking it until it all but seated. At least I think I did. I've only read that misaligning the keys will cause it to break if you try to tighten it. What the hell? Maybe from the enormous amount of banging and it sort of cocking in the mount taper caused it to crack? It was really stuck in there. Don't wanna break another one.
Follow Ups
Ok. Found the problem. But don't understand what happened - Zxpress12:34:08 03/10/23