I had such wonderful responses to me query about the expansion globes, I am going to try for another success...do you HAVE to use stainless for the cylinder, my kit came with a mild steel cylinder and stainless would be hard to find where I live, not to say expensive. I am assuming that many of these have been built using mild steel. Likewise the use of copper for the hot cap, I know that would be preferred but again it was not in the kit and is it necessary.
Thanks, in advance, for your response...Carson