Jose,
The one you have is very similar to what I'm looking for. The expansion tube is a bit longer on yours and the exhaust stack mounts closer to the front of the chamber than mine did. The tube looks so similar, it might have come from the same maker, but was probably a later version. It also looked like it might be heavier. I have actually located one of the originals and will see if I can get it and reproduce it. If not I may take you up on your offer. Thanks a lot.
Alan