Maybe this helps...
Yes...that helps a lot! Although that Todd is a bit exasperating to listen to and watch, with all his pauses and "meaningful looks" and heavy accent! The problem I was having was that I couldn't get the top and bottom of the tank to unscrew from the pyrex tube (and was worried I might break something). After I saw ol' Todd do it, I got my courage together and, with wrapped pliers, was able to get the top piece off. After that it was easy to get the bottom off. At that point I could see where those silicon spare gaskets were supposed to go...should they be needed in future!
Thanks!