^^ Sadly, the stress and torque involved would probably break glass. Could stick one on a metal pipe though..
Oh I understand it would have to be metal. I much prefer glass but if saw one of those I couldn't not buy it immediately
I guess it is just to make it look cool. You can use it as a place to put your thumb to help hold it. When I bought it all of them they had (in my price range) had the "bubble" on the end.
Ya it is, not my favorite but the only one I have right now. Going to the head shop this week to find a different one.