Long day, still feel really beat up. I did learn something through all this, LB can get much cooler with 5 potential tube mods. As they say, necessity is the mother of invention, and Alan is quite the inventor. 1. Glass insert for smaller ID, as well as telescoping effect (2 mods in 1) 2. 19/19 taper length (slice 3 or so mm's off a 19/22) 3. 1/2 inch hole bored 1/2 inch deep for screen mounting depth and precision 4. Ball of hemp fiber, to your density selection, inserted into glass tube 5. Vent holes at the tip of the taper Sweet Jesus! Even with the delicate throat / lungs, I'm doing okay. This particular inner glass tube and wood tube fit loosely, really easy to telescope in and out to increase distance. I think the glass can vary a hair, because I know the wood is dead on every time. I would imagine, the glass inserts are also easy to keep clean, and installing hemp is visibly under control (nice feature of the glass is the control of the hemp). The taper adjustment is quick on my disc sander, and the drill press makes easy work of the half inch hole bored in the tip. I'm getting a different looking ABV and that's how you know something on the heat transfer level is being affected. I think I'm getting a browner / golden roast, interesting enough. I'm sure @Alan could explain in scientific detail, but maybe more air added to the mix from around the sides of the insert at the top down. I also think the glass tube sucks up some heat, as I can feel it on my lips a bit. Whatever is exactly happening, I've always thought the tube is where it all happens, and Lil' Bud's job is too place an energized coil just in the right spot. I can lean on the switch, a lot, so I'd think in all honesty, I might loose some battery efficiency. But at those times when I need cooler hits, I'll probably be taking less of them, so I won't notice. In all reality, what we may be talking about here is a special *Manually Regulated Roasting Tube* made especially for LB, complete with glass insert, hemp, short taper, vent holes, half inch bored tip.