I love that idea, but I can't see how it would ever be possible, with the bottom airflow the Achilles has; there's just no way to come up into the well from below, and if you tried, it would probably leak.
Another RDA I'm *considering* is the Dead Rabbit SQ, which appears to be tighten-able, perhaps even to my exacting standard. But it's a little pricier right now than I would prefer ($37) -- not out of the question, the first two KFL+ clones I bought were $35, but as an experiment, a bit much. Hoping to see a good sale on it at some point, or maybe just a lowered price as new stuff comes out.
Andria