a few weeks ago in my college ceramics class i made a bong, and i read online that the stem hole's either 18mm or 14mm so i made the hole in the base a little under 2cm,but just found out that it meant the hole in the stems 14 or 18mm.......anyone know how i can fix it? the bowl my friend gave me is 14mm but the holes around 18-20 and i don't really wanna buy a new one. thanks for any help
Throw an 18\\14 downstem in that, don't you need a downstem anyways? I'd be surprised if you made an airtight hand ground 18mm joint if its out of ceramic and eyeballed.
I'll try a grommet. When i was building up the hole for the stem it got pushed in a bit and the inner part of it's like 14mm now, so i don't think a downstems gonna fit :/
I had a similar issue; I had a 18mm glass bong, but I had bought two non-refundable 16mm Cheech Double Perks by mistake. Crafty Solutions I used: -Sticky Tac around the rim of my bongs stem; It sat pretty cozy & kept air flow nice & tight. -Bought a 16mm stem for my bong, slide it in. It had a nice big ring around the top of the stem and once again sticky tac wraped on the edges. I had no issue with burning the sticky tac, be careful though. -Modded bottle cap with hole in the center, once again sticky tac. This time less direct to possible contact with the smoke. LOL BEST Solution I can think of is making a 20mm to 16mm glass converter piece in class. Sorta like mini cone shape to it. Best of luck!