I put new brakes on my wife's Rav4 this past weekend. The only thing I hate about doing brakes is trying to get crusted rotors off, after a few Buffalo winters they like to stay on the vehicle. Her Rav was easy because the rotors had M8 tapped holes that I was able to use with a couple bolts to pop the rotors free in seconds. Is there a reason I wouldn't want to drill and tap a couple holes in any rotor for any vehicle before I install them in the future? I can't think of any reason it would really affect any balance issues and it makes the rotors so easy to take off it would be well worth the trouble.