Graf Von Wolfsburg

Interesting idea - that might work! I only have a "woodworking tolerances" stop on my drill press (the kind that looks like a ruler and is maybe accurate to 1/32" if you're lucky) but adding a digital depth gauge would certainly make this approach more feasible. That being said, if you get pretty close on the initial cut and you don't need to take too much off, the trial-and-error method I used isn't too cumbersome. My suggestion: give it a try and post your results!

I would share pictures if I had some...but I don't have a ready means of getting images. You can do astrophotography of "bright stuff" - planets and moon - with a Dob, but the really cool stuff requires tracking and long exposures. They make little web-cam like things that will fit in the focuser to let you take pictures, but I don't own one, so (short of holding my cell phone up to the eyepiece) I don't have an easy way to provide images, let alone good ones that accurately represent the quality of what you see looking through the scope. Sorry!