Shorten a tank

[Myka]

Whoops! I meant 3/16". Ya, I'm worried about scribing because I know it won't break nice if I can't do it in one smooth scribe and one smooth move to do the breaking. I don't think I can do it. I wish I had a junker tank I could try it on. If attempted to scribe I was going to scribe a short end first from the outside, then try to break into the inside. That way I could get a good scribe, but not sure how to do a good break to the inside.

Oh I know...I am freakin lucky with the chainsaw.