HighValleyRanch, They can be hard to turn. I never tried it though. He has a special vice mounted on the front of his truck, so setup is always ready to go. Carries the rest of the tooling in the truck of course. Special blocks (different depending on SA Colt or Ruger or...) to fit the barrel. then special block to fit the cylinder window with a long arm to turn with. Doesn't take much ... This was Bob Munden's setup. Jeff Ault took it over. These way when customers wanted a sight in of there Vaquero or Colt he could do it all at the range. He would then send a target with the tuned revolver back to the customer (believe Jeff still does that).