@hotmeals Thanks for the info, Bonger confused me for a minute. The stem goes way up, to the ccd bottom. Bowl/tip does pop in at the stem base.
I put the 2021 M/XL's tip on there as it seems to get hottest.

With my tremor, going to drop a hot Dynavap piece one day, hopefully not in my lap.
BallR/technique. I've been using a tabletop torch with dual blue/yellow flame, but threw in the Cyclone 2 torch in the 420 order. Normally I use the tabletop's yellow, which can't allow pinpoint as it's, hm, third of an inch thick? So I'm heating a wider area. Brief use of torch shows it's less forgiving than that yellow flame, got a bit of stinky combustion. (That smell has gotten offensive since I chose this path. Cleaned the heck out of the old bong and it still smells burnt.)

I could be mistaken, but I think the Dynavap system is fairly forgiving. My sloppy all over the place heating still delivers what it should from the taste hit to "yeah, it's definitely beat."
I appreciate this community. Talking about DHV or TEDs locally isn't educational...
CR