Gas + agitation = fumes. Better be sure your drill motor brushes don't make a tiny spark while the drill is running. How's your fire and medical insurance coverage? Cast iron shrapnel from a transmission case probably makes a better bomb than a pressure cooker, too!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!