Ben, thanks for the kind words. I printed 2 of these for myself about a year and a half ago and haven't had to really use much else. I experimented with a completely hidden fan version for a while but pretty much use the offset all the time. I've never been one to use an HM during high temp cooks, but given all of the recent banter on the forums I decided to try this damper while finishing off some sous-vide steaks at 600F. I ended up being able to control my BGE with only 55% to 60% fan utilization so it seems like this design can handle all temp ranges with stock fan specs.
Bryan, I made the path length for the wire just slightly longer than the maximum required servo range. There is a sweet spot for aligning the valve but it should run smoothly if you hit it. The key to this design is that there is a closed air path from the smoker to the valve. To make sure that there were no possible leak points along the way I had to separate the servo and the air path. I also don't like wires all over the place so this sort of necessitated the fan wire guide.