Sorry if I took it personally I understand not everybody has measuring tools or machining confidence. If you don't know what you're doing brakes are not a good place to start experimenting.

And don't worry when I did mine after I smooshed the rotor into some mud to hold it I used both hands on the rusty hand drill so the holes would be straight. It worked much better than my first technique where I yelled "pull" and shot at the rotor with a pistol. I could get the pattern pretty close but the holes were either too small with the .357 magnum or too big with the .50 action express. There's nothing like the right tool for the job!