ThermaCELL Butane Recharging Question: Different Butane Dispenser nozzles?

So I realized that while I'm not quite being robbed, there may be an easier way to continue to load/reload my butane cartridges sold in ThermaCELL devices.

After some YouTubing, I've been able to take the check valve out and replaced the brass fitting. But when I go to refill with butane, I can't get a solid seal on the fitting with the Ronson 2.75oz Butane canisters I find.

Is there something else I should be shooting for here to get this refilled? Mods I'm posting here instead of the Outdoor Board as I think a ton of people use ThermaCELL's on their patios and in their backyards and not just for hunting and fishing.