Fine thanks, I didn't get an email from you recently. Maybe you sent it to my old qtm.net address instead of my latest gmail.com address? I always forget to check my Juno account. Yes I let the concentrator run for a couple of minutes before using it so it will purge atmosphere air for nearly pure oxygen. I just leave the oxygen knob open before during and after lighting. In fact I seldom turn it off. No I don't use any special procedures to turn the flame off. I just turn it off. Remember not to add any extra force turning it ff. It isn't a leaky faucet and turning it too hard can damage the seal inside.