Ive seen a STOCK (supposedly better 1979) tcase shaft break at 2400Ft/lbs and 70 degrees of twist.
Then I seen a stock CRYOed tcase shaft break at 2400ft/lbs and 70 degrees of twist.
This was on BOBBY's machine.
Bobby had no way of testing R&P strength with the machine. I have never seen a R&P tested both ways so I dont know for sure.
But after seeing other materials (tcase shafts that were tested identically) offer NO GAIN at all, I dont see the benefit or gain.
Bobby would say it helped, but had no way of proving it. I found it odd for a guy that had to "test" everything, he just "believed" in cryo with no PROOF.
Just my .02, save your loot.
And as far as I know he just used his OWN pottery kilm and deep/cryo freezer. No real complicated stuff there.