I have decided to go ahead and give the 555 "Honda bearing mod" a try. I've been fishing around the local machine shops and have gotten an overall cool reception to machining the intermediate shaft.

Only shop I found that was willing to try to machine the intermediate shaft says he would "grind" it. I would have assumed it would be better to just turn it on a lathe with a ceramic insert given it only needs about 6 thou removed.

Just looking for thoughts on this from those have a better grasp of machining case hardened parts as I am no expert. These shafts aren't overly plentiful so I would prefer it be done right.