Hi guys, I bought my other half a HBM Tig 200 ac/dc welder (he wanted to mend the fins on his old Honda engine (aluminium), well it arrived and we realised we need to buy gas - I have no idea what I need to buy him to link the machine to the gas or what I should be looking for with regards to the gas bottle - can anyone give me some idea of what extra stuff I need to buy ?