Feeling kind of stupid on a Friday night. I seem to have bought a stripped-down fire extinguisher instead of a CO2 tank that I can actually get gas out of. (I'll admit, I thought it was just a carrying handle.) Am I totally out of luck, or does someone know of a gas place that will swap off the top hardware? Better yet, are there ANY gas places open on Saturdays? I really want to get this set up before the auction. Grrr. Thanks Darcey