Ok, some tips for buying the gear... Go to a big hardware store like Hardware house or Bunnings.. etc.. Then just ask for the gas fittings area.. Go there.. Take a BULB with you... Then just sort through the bits looking for the bit you need(like in the photo) (u can just fidle around with stuff in those big H/W stores..) Look for the L shape gas fitting , they come in a few sizes so you need the bulb to see which one has a sweet as fit.. There is one thats perfect (like our one).. its gotta be a nice smooth fit so the bulb has only one place to go, to the nail.. There will be a cap to suit in the same section.. Now the nail length/position is the only hard bit. make sure u use a fairly sturdy nail so it lasts for ever. Basically you must dril the hole for the nail so the nail will line directly up with the bulb. Then you have to kinda work out how much the nail needs to go in, in order to punctue the bulb at the right time.. see if you set it to long, the bulb will punture to early, an the cap wont be screwed on enough to stop gas getting out.. If the nails to short, you will find you screw the cap fully up b4 it punctures (aka it doesn't work) ...
You gotta get it so it punctures the bulb when the cap is about 3/4 on.
This may sound complicated, but realy its easy... just make sure you have a bulb with you. Once you'e made this puppy, theres no telling where you an go... just add on screw in gas fittings (like the valves) and tubes and you'll end up with a machine like ours..
You can even then make an "external storage machine" which we are making, so you run a tube from the valve to a "gas storage container" (anything- maby 6 big balloons tubed together).. Oh the possibilites are endless!
Yes, and with that thought Tars.. I can not be held resonsible for u non-engineering type people screwng things up... But i will say, its not hard, and has little chance of "blowing up" as some people say, seems its all one piece of thick gas piping.... Id say one of those ISA ones is more likely to blow with multi bulb action!
[This message has been edited by ChEmIcaL_NiGhT (edited 05 June 2001).]