[Ol' Bob]

Well, it was a big old oxygen bottle that I cut the bottom out of. If I'd known how thick the bottom was, I'd have cut about a quarter inch higher up. As it was, I was grinding into the solid steel of the bottom which was nearly an inch thick. To cut the tank, I used my 14 inch Milwaukee abrasive cut-off saw and a 4.5 inch angle grinder with .45 cut-off wheels. At the top, I removed the valve and welded in its place an old trailer hitch ball that I'd drilled a conical depression into the bottom of the bolt end with a half inch countersink bit. The pole was a three inch diameter steel tube full of concrete with a few inches of re-bar set in the top. The re-bar was sharpened to a needle point. I lifted the bottle with the tractor bucket and set it softly onto the point. I can't imagine the pounds per square inch on that point. That tone pole is an E-flat. I wish I had more gas bottles.