Welp, I broke it.
My first RBA, and first glass tank. I tightened it down too much and cracked the glass. Ruined my night, and I'm still a little sad about it.
I found a replacement on a UK site, but it was sold out.
Getting it cut at ibtanked would cost as much as just buying a new one, but would yield 3 tanks. If I decide to buy another, I'll go ahead and order some tanks from them.
So anyway, I improvised. Fasttech sent me a T3S with a detached chimney. So I ripped it apart and trimmed it to length. The top just snaps off, but had to get aggressive with the bottom.
I cut it to length with a pocket knife, following a groove that was already there. Sanded the cut edge by pressing it into the corner of a sanding sponge and twisting.
The bottom fits better as the T3S has a slight taper (now I know). I put the wide part near the bottom. It has to be twisted down tight to keep the pressure, but it's holding well and allows juice down the side of the chamber nicely.
For anyone interested, or with advice on where to source a proper replacement, it's dimensions are:
Length: 32 mm
Outer Diameter: 15 mm
Inner Diameter: 12 mm
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In other news, I solved my wicking issue. A 2 mm coil allows for a little thicker wick. Trimmed and fanned it onto the deck, Kayfun style, with no tails in the juice channel. 2 tanks in and it's staying wet for full open lung hits. I'll know in a month if I want another one.