Hi again!
After many experiments, I'd like to share my final setup.
Parts
Standard stuff:
1) a mod (I’m using Vaporesso Gen),
2) Wotofo Profile RDA (the bottom part),
3) VandyVape SS316L 150 mesh,
Innovation:
4) GlassCo ISO 29/32 joint tube (002.202.07) @
Joints, Cone, Unprinted, DIN/ISO
5) two O-rings (thickness: 1.5 mm, inner diameter: 18 mm - these are ideal - buy more!)
Optionally:
6) GlassCo 29/32->19/26 adapter (014.202.04) for a 19 mm water filter (there's also one for 14 mm available) @
Expansion Adapter
7) a water filter/bubbler/whatnot
Setup
You need to drill a single Ø 5 mm hole, starting ↔ 10 mm from the tube edge (see the photo). This configuration works best, IMO.
Notes
I suggest buying a few more tubes, just in case, because glass is hard to drill in. I had it drilled by a local glazier for around $2.50. Be persistent, because at first my guy said it's impossible, but then was able to drill all 4 holes I commissioned just fine. This lab glass is probably sturdier than he expected.
Thanks to using glass, everything inside is visible to the sitter, so they know precisely when to take the device out of your hands. I prefer to set the temperature to 240°C (in TC mode), to have everything vaporized in a single 2-3 second toke.
The connection between glass and RDA using those bigger O-rings feels very tight, sturdy, it doesn't wobble at all. I was surprised, it's like a single piece.
Also, a fun quirk is that this particular hole configuration (Ø 5 mm, ↔ 10 mm) whistles audibly, hah.
Photos