The first really helpful tutorial here on Youtube. Big thanks to you! But my G5 pen is still teasing me. It's either full on combustion or nothing at all. But I've just ordered some of those glass screen instead of the steel mesh to see if it helps.
It can take a while to get vapor out of the pens sometimes. Sometimes up to 30 seconds or more to get hot enough, depending on how your heating coils go. You should be able to taste the vapor, though. Good luck with the glass screens!