I note that the Kuiu has magic wands much like the Dana externals. They're part of the frame, but serve the same function. I also note that there are quite a few internals with similar wands. To me, those wands are the genius of the Dana externals. Everything else about the Dana externals is solid, but pretty ho-hum. Lots of room for improvement.
I've wondered more than once if Dana is getting any kind of royalties on all of the "magic wands" out there, or even if he was the first to use them.
