that's an excellent point Rhelton...and and plumber/gas fitter buddy actually pointed that out at the time (one of the reasons why I binned it)...though I actually may have an alt solution (it came to me in a dream last night

)...
So as a proto I'm thinking hammond box (ya groan away, plastic OTS box) but as a proof of concept it makes it easy (and inexpensive)...
What is the typical Hammond?, the 1590? or something like it?...it's the one that's 100mm high, 50mm wide and 25 mm deep (incl. lid)...it's the one I used in my Russian tractor
View attachment 394434View attachment 394434
obviously it's the one on the left...
see if you can follow me (I'll try and do a sketch-up and up them as jpegs)...my plan (dream) is to buy 2x of those boxes...in the one box build a dual 18650 bf mech (no provision for a bottle)...now on to the 2nd box...bin the lid, you won't need it, lay the box on the mill (back down) and and shave it down so that it's 10mm deep measured from the outside of the back (shave the screw posts and pc board notches so it's just a clean container).
then fab a plug out of? (in my case I'll use 6mm thick lexan sheet) that's 90mm high, 40mm wide, spray it all down with silicone release and suspend the plug so it's flush with the top edges the cut down box then pour Dragon Skin slow silicone in...once cured pop out the plug and pop the silicone "container" out of the cut down 1590...then mill out a nice size squonk hole in the back of the cut down 1590. I chose Dragon Skin slow cause it doesn't need degasing and cause it's tough, 2mm's thick of the stuff should be good for a couple billion squonks)
Then, mix enough dragon skin to do some brush on work, wet up the dragon skin container and stick it back in the cut down 1590 (with the new squonk hole) then wet down the 5mm edges and attach it to the back of the dual 18650 bf I built (and for good measure, 2 part epoxy the boxes together).
Inside the dual 18650 box, 6 +mm up the bottom, bore a hole big enough for a feed tube so it accesses the void of the dragon skin container stuck on the back...somewhere near the top, bore a hole for an "o" ringed fill screw...if you've followed what I'm saying, the "new" 10mm thick back of my "extended" 1590 becomes a bottle (btw Dragon skin is food grade silicone)...fyi 1ml = 1 cubic cm so you've made yourself a 21.5 ml bottle...I also plan on doing this with a clear 1590 at first for visual reasons though you could mill a liquid level view cut...
...this is super weird paradigm changing stuff here but if this works (and doesn't leak) imagine being able to simply add a bit of depth to your mod and it becomes your bottle?
Ya, it'll be big (ish), but again, it's just a proof of concept...
And Gdeal, you da man for digging up my old research, but by doing the Dragon skin pour you're back to squonking but the "bottle" and all the space and BS assoc. could be a thing of the past.
just saying...comments?