Yep, the tenon is delrin,
I think?
Also, the briar wood is not exactly raw, it gets a special treatment to give it a little more protection,
Wayne told me the specific finishing technique he used, but I don't wanna step on his toes and reveal any possible maker secrets, so I ain't gonna say how he does it.
Harris,
I think you'd love a briar stem, I think it's actually a little softer than ebonite. Bite marks happen instantaneously upon the first clench, but never seem to get worse than the initial imprint unless you really really chomp or chew --- in this way it's sorta like one of those foam mattresses where it conforms totally to your dental imprint and one reason why it's so grippy too...
...if you look at this thread you'll see some of the historical examples, and you'll also see some 50+ year old briar-stemmed pipes that look a much damn sight better than old vulcanites of the same age:
http://pipesmagazine.com/forums/topic/are-wood-stems-better-than-plastic-stems
PS
I think he actually has another one available at the moment,
if it ain't sold yet.
:P
(...it's the black one pictured in the above thread,
Wayne usually shoots for a 3.8mm bit thickness
so that's right in your wheelhouse!)
Sable,
I was looking thru an old ish of P&T and saw a Butera AllBriar that was just gorgeous, they look really amazing when all smooth with a natural finish, then I looked at the old Kaywoodies and I thought they were cool as hell, but I wanted a blast version, so I contacted Wayne and he was as enthused about the project as I was and it all came together --- but I did learn a valuable lesson, I contacted him for a commission like a month anda half before the Chicago show, duh? I was clueless, that's like the busiest time of the year for any pipemaker!
He was very gracious and easy to work with!