I've got a camping gaz refill adapter from the same seller in Japan. I started refilling from the butane cans as the CV270 canisters are now impossible to get where I'm at and there are times when a CV470 is too big.
Yeah, like day and night. And Mon - Fri and weekends. lol. I think the 450g CV470's are too big to carry on all but extended trips. And maybe for snow melting. Those suckers are BIG.
I think Jim has written out quite extensively the hows and whys and the safety precautions. I've not had any issues so far.
Thanks.
HJ