Sorry for OT, but I did make the sight mount out of Aluminum on my Bridgeport. I have a "Ruger Mark II Gov. Target" that I bought new 20 some years ago but have only put a few hundred rounds through. A couple of years ago I mounted an Aimpoint 40mm Red-Dot sight on the dovetail sight mount I made to fit the existing rear sight. After dialing in the sight at the shop, I could cover a group with a quarter...fine by me! I brought 250 rds of CCI Mini-Mags and half a dozen magazines to the range just to burn up some ammo. I set a standard torso type target at 30 feet and used a bench rest. I use 4" x 6" shipping labels with a simple cross printed on them to "repair" the target. The first 5 shot group was 1" high so I dialed it down. On the sight adjustment there is the word "UP" and a little arrow pointing counterclockwise. The next group was even higher. Hmmm. So I dialed it counterclockwise - against all logic! The next group was right on! After the first 100 rds. of nice small groups I experimented a bit with my grip and the way I was "seeing". Something just clicked...I would see the red dot change to a bit darker color as a hole in the paper appeared under it. The next hundred rounds all went into holes the size of blueberries. With the last 50 I made a smiley face complete with eyebrows. As I was paying the bill, the owner said "I see you got bored."
I've never been in the zone like that before, I only hope I can do it again!