Well my downstem broke (the female part). There's a piece broken out from the middle of the long stem part. Like a hole basically. I have the piece that broke off. I think i can glue it if i needed to, but i just want to upgrade to glass on glass anyways. So my bong is a regular rubber one with one of those grommets. I asked my friend and he said that it's not possible because glass on glass downstems are different shapes and it wouldn't fit my bong, but i'm pretty sure it's possible, i saw someone else do it on these forums. Anyways, what do i need to do to upgrade it? Any special questions i should ask while at the headshop? What do i even ask for? Oh, and what part of the downstem am i supposed to measure? I'll get pics up soon, thanks in advance