Thanks for the link Ash. That answered all my questions about the two different versions on the Vernon.
I bought the pipe under the assumption that it had a stuck innertube. I very gently worked some alcohol around the tube and cleaned the shank with pipe cleaners and alcohol. That tube seems to be permanently attached and I did not want to go any further until I found out what I am dealing with.you should be able to unscrew the remaining stub from the shank