Originally Posted by ArcadeImp
Yikes! You got me there! How do I tell??
I'm also editing the first post with the address of the place. The guy was incredibly nice and spoke English, he threw in a couple freebies and knocked a few thousand pesos off the price. Very cool place but we only found it by accident.
Just take the stem off the base and look at where the smoek would go up into the hose port. If there is two holes there (one directly to hose, and one directly to purge valve) it is traditional. If it has more than that (usually 4) it is a common chamber, which is considered sub-optimal.