[QUOTE=bh2k]The heatexchanger is pretty ghetto and messed up, but it should get me going got a start. I cut myself very badly putting the 1/4 inside the 1/2 so I didn't take time to bend it real well.

ouch i did the exact same thing piped me thumb and got a big flap of skin, it throbs for days and bleeds heaps.
also i love ya avatar.
keep it up, i am having the same problem.
co2 fire extinguisher a though, make a valve and put some into a 9kg gas bottle and keep filling that, or get a regulator.