Answers by Expert:
21 years in drilling balls,9 years running Pro Shop,cure grip problems,Fix approach problems,coach handicaped bowlers, certified coach instructor, coach Crankers,Tweeners,Strokers,Ex Ball Tester,A Mechanic on Bruswick machines,B Mechanic on AMF,Resurfaced lanes (Wood),change oil patterns for different ball reactions to train & test on.Hints on ways to clear/relax your mind on the lanes.
American Bowling Congress 32 yrs.,PBA 20 yrs.,
I learned from 3 Ball Drillers & then, develped my own styles of drilling.I EXPERIMENT ALL THE TIME (THE BEST WAY TO LEARN!).