FWIW, I remembered a box in the closet that had multiple boxes of Boge SS cartos. I broke one out, filled it using the condom method, and starting vaping. It was way too simple. Squirt the end cap full of juice and insert carto threaded end down. Wait a few minutes and vape.
It's not bad at all. You can't go over 6 watts or so, but the vape is like I remembered it. Good flavor with a slight amount of warmth. When the flavor starts to wear off after a few fillings, chuck it and unwrap another.
The cool part about cartos is that you can get away with changing flavors if you vape the old one down before you change (and you aren't really ticky about a little remnant flavor at first).