To clarify...

Glass expands slower than metal. when you put a metal screen in a glass piece (bong or pipe) and heat it. the metal begins to expand inside the bowl. this actually channels the heat like a magnifying glass into the bottom of the chamber... eventually.. slowly but surely if you keep using a metal screen, a hole will be bored into it... over time.. it will just.. break.

handy little guys to have..

Hey funky... you talking about "Under the Sun" up in RichmondHill ? on Yonge, just south of Major Mac? if so, yes.. it's still there