I recently discovered this problem as well. I tried wrapping the GI cartridge with tape to increase the neck width and was able to get a good enough seal to repressurize the bottle to a point and then it started to slowly leak. This was better than the standard CO2 spray that occurs when popping...
I just ran across one of these at the local grocery store and hit the internet. I've been looking for something like this to take to meetups.
How long are you guys priming in these miller/coors bottles? 1 week? 2 weeks?
Also, when priming are you capping with the included tap or with a...