Stop in for a cup of coffee

Usually only weld for 15 mins or so. So theres that......besides, Im POSITIVE it wasnt leaking at the regulator connection....
What i was getting at , Mitch is not how the bottle got empty, is just that you should check for gas leak every time you replace the bottle. Every time i change bottle, and think its tight enough(for the last 20 years) i discovered every one leaks unless its really tight. I no longer assume its good enough, and i bet i get 1/3 more out of the bottles now.