O.K. I am a 61 y.o. lefty. I have been bowling for, well lets say, more than 39 years. I have been on the PBA tour( found out how good I WASN"T. My question, I have been told my axis tilt is anywhere from 45 to 90 degrees. more to the upper side. Can anyone tell me a good way to keep under the ball to have 0 to 45 degrees tilt? I realize its muscle memory. I have been told a good way to check, if you do not have video is place a piece of tape under the finger holes and watch the rotation. I am a 210+ avg. on most shots. I suffer as you might expect, on long oil(Nationals shot).  I have a 5 3/16 span, 1/8th reverse on the thumb with 1/4 left. 3/8th reverse on fingers. I have no problem coming out of the ball, no sores or trouble. I have been told that I may need to change the pitch on my thumb from left to right. That lets you out of the ball sooner? and causes u to stay under the ball longer. Sorry for the lengthy note. But I am still very competitive and compete frequently. Thanks for the great site. 

thanks for the reply scotts33. That helps explain everything. Guess your right it is the rotation I am interested in. My is usually 90 degrees or about there. Question, I know it takes practice to acheive this. Can span or pitches prevent me from doing this without difficulty? I know in the past when I try to pull my pinky in or index in, it feels really funny. Is that because of span and pitch or just something that takes time t;o get used to ? I know this will take time but that is a great article and I turely appreciate your advice. I haven't read the other article but will let you know. Oh, does axis tilt need to be addressed or does that change with rotation?