[NonWonderDog]

That was much easier than I expected.


[EDIT]
...and now it works without disabling visual engine damage. I thought that seemed too easy. Now I just need to fix the ugly backup sight and I can move on to something else.

I also just found a copy of the Aircrewman's Gunnery Manual, and it's a gold mine. It turns out that I was completely wrong when I said a 35 mil reticle sounded unlikely. It turns out that every USAAF and USN defensive gun used a 35 mil reticle (even on the ring and bead sights). I still don't see any reason for a fighter to have a 35 mil rather than a 50 mil reticle, but that doesn't mean it didn't happen.

Even with my fancy new manual, though, I don't understand why this N-6 gunsight reticle seems to have a notch in it. It doesn't look like damage -- it's etched into glass, and it wouldn't become "more etched" if it was scratched. That notch in the reticle seems to be present in this illustration, too. Is the first reticle damaged in some weird way, and the second illustration a coincidence? Was it a ranging mark? Did it spin to indicate turret facing or something?

I did run into one reference to USAAF "70 mil" reticles being identical to USN "35 mil" reticles. That makes things confusing, because I thought that USAAF reticles were cataloged by crossing speed, weapon type, and radius.