So, the new butane conversion unit showed up in today's mail.
Some quick tips. If you want to shove one of these into your "old faithful" case, make sure to clean out the insides of the case. Mostly you want to get rid of the old flint dust, mung, and random crud.
The first fill of butane wasn't dramatic, just do a quick purge of the tank, chuck it in the freezer for an hour or so, and page up a couple of posts on how to fill these things. After that, I let it warm back up and slipped it into my old case. I wound up making a slight adjustment to the flame height and that was about it.
One quick note- on that first fill expect to have some air in the tank along with the butane. This isn't a big deal, the first couple of lights will be sloppy as the air gets purged out (butane liquid and gas is heavier than air and the pressure in the tank will push the air out, tout sweet).
So, for less than $20 bucks this is a neat way to bring back or update an old lighter. Recommended.
The only real downside is doing the refills. The new insert fits tightly to the case (which is good) but its also plated in thick chrome which makes it as slippery as an eel in a bucket of snot. So, plan on doing your flame adjustments before the insert goes into the case and take it easy on the flame height, you don't want to be refilling this thing every day. As long as I can keep it working for one to two weeks on a charge, I'll be happy.