I'm going to share a way to make an amazing bowl if you have everything you need.
  • 12 gram CO2 cartrage (needs to be empty, get from a paintballing friend or someone who owns a BB gun)
  • Pipe cutter if you have one otherwise a metal saw.
  • Sand Paper
  • Drill with appropriate size bit
  • Screen

  1. Cut the EMPTY CO2 to the size you want it with the pipe cutter/saw. I make mine rather big cuz nothing beats a 3.5 gram bowl.
  2. Sand the inside because it most likely isnt the cleanist lookin thing in the world (could have rust if you have a low grade cartrage). Pinky fingers are key here. If you're picky use a coarse paper first then move to the finer ones until its smooth (makes it easy to scrape out resin later)
  3. OK now get ur self some vice grips or clamp or even some good pliers, now drill a hole in the "top" of the cartrage. This part could be hard for those of you who don't do much drilling. I use 15/64th size bit cuz i have glass tubes that fit in there nice and snug.
  4. Some people i know boil the thing here just to ensure it is clean, i dont and have smoked out of 5 of these bowls using bongs and pipes.
  5. Put you're screen in now and there you go you have a great bowl to use for bongs, pipes, and what not.

Here are 2 pics of a nice one i'm in the middle of making. Haven't finnished sanding (hard with the deeper bowls) also still need to drill into the thing.
Pic 1 Pic 2