I very seldom measure anyone that needs right thumb pitch. Occasionally 0, more frequently 1/8 to 1/4 L. Make a fist in the same manner you would grip the proverbial Coke can. Now try to move your thumb in the R pitch direction (for righties, reverse for lefties). Feel a lot of resistance? Now move it in the L pitch direction. Moves easily, doesn't it. Now put your hand roughly in a bowling grip and try moving the thumb similarly. Same thing? If you miss the lateral pitch on the R side, you can very easily lock the bowler into the ball unless he turns the ball early. I know this, because my grip was that way for over 30 years. When you make the fist, if your thumb falls between the RF and MF, I figure that's 0 pitch. On the MF is 1/8" L, and between the MF and IF is 1/4" L. I very seldom find anyone that needs more than 1/4" L. -- JohnP