Check out the ASA USA Pitching video. Take a look at Cat Osterman and you will see exact rotation on everyone of her pitches. In my opinion too many instructors move to fast and spend too little time on mechanics. My daughter's original instructor was the girl who filled in for Cat at UT when she took the year off to pitch in the olympics. She drove me and my wife crazy because she had our girls doing the same thing week in week out. I was watching other girls who had other instructors doing new stuff every week and I finally spoke up. I was told that if she didn't have a good base to start with she would always have problems. My daughter is strong mechanically but still doesn't get exactly 12-6 rotation but it is something we strive to achieve.