Having worked in aerospace machining quality control for many years I know that the human eye can lineup four points to within .002".
I also know how often holes drilled and tapped on a cylindrical surface can be off center. Pretty often. Especially when using very small bits and taps despite being center drilled with a rather rigid centerdrill.
Can't wait to test my Reticle-Tru out.
The Chosin Few November to December 1950, Korea. I'm not one of the Chosin Few but no more remarkable group of Americans ever existed.
