OK I just popped mine open. Took me a while to get a nice grip on it and somehow I manage to open mine up. I couldn't do that with some of the other ones thinking they might be glued on somehow. Thanks for the ideas, I try the easy teflon tape way before I move on to the messy stuff.
Ya, we are having the exact problem here in Canada. Yours is not the only case. This seems to be happening to both new and the old version of these gas canisters. "Devise" or "Device" LOL . It’s must be a design flaw.