I found this thread moderately helpful today. i got an old colibri cigarette case to use as a business card holder, and it came with a matching lighter.
ideally, i think, you would have an adapter with an off-center hole like this.
i do not have one of those, but one of my butane cans had other adapters on the lid, and i was able to make do with this fat one.
i canted it to the side a bit, so that the brass plunger wouldn't plug the hole, and when the lighter body got cold i knew it was working.
incidentally, whilst researching this today, i found out that you can clean a butane burner with zippo fluid and a q-tip. so now my knockoff st dupont works again. it's a great day for fire-making,