That's pretty much what I was thinking, which means that the draw and heat exchange are adjusted simultaneously. That also means that in order to get a looser draw, you would need to unthread the top cap. I'm hoping that the draw with the top cap fully seated will be sufficient since it will look its best with the top cap fully threaded on.
The draw and heat can be adjusted independently or simultaneously. Each air passage is 1.32mm x 4 air passages, which flow can be adjusted from 0 to the flow of all four holes open. Now, more airflow is going to reduce temperature, but loosen the draw, so what you can do to adjust them independently is block of 1,2 or 3 of the air passages, making the air flow through only 1 or 2 passages, which will reduce the heat the air picks up (less surface area the air will be coming in contact with). Then open the draw a bit to compensate for the reduced passage (if you block one passage, you still have the flow of 3 x 1.32mm holes, with two, you still have a max flow of 2 x 1.23 mm holes).
And as far as the gap, it stays minimal path 77 and will seal completely when tightened, no draw comes in when tightened all the way down, the mating surfaces were machined so precisely to each other, it seals completely when closed. This adjustable draw system truly works.
Oh and the smallest silicon plugs like this (or any equivalent) here should work 1/8 x 1/32, just stick in the top hole(s) and trim off any excess flush: http://www.mcmaster.com/#tapered-silicone-plugs/=p0705z
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