Thanks! Being a beginner - I find the great folks on this forum to be a big help. If this setup fails, I may try something using the original steel plate which sandwiched the old element to the boiler. The problem I found with my boiler (and maybe this is normal), was that the boiler is not a true cylinder. So it took a bit of trial and error to fit my new elements flat against the boiler for good heat transfer. That's why I also used thermal grease.
My next question deals with variacs and dimmers - I know a lot of people use them and they're discussed in a many other threads. I'm going to start a new topic and pose my questions there in hopes that all those great tips can be consolidated for other novices like myself.