After my last post I gave the AB another clean with lacquer thinner,
then reassembled it, tightened everything up, and was fine.
The next time I came to use it started bubbling again!!!
Having played around with it, I've found I have to really tighten the
head up with the spanner, and then it is fine. The teflon washer looks
fine, but I'll order a new one as a precaution.
I do at least now have the cleaned AB this side of the Badger factory!
Karl