Lefty50,
For me it makes sense. Away means away from the palm/laterally out, under means under the palm/laterally in.
The old coke bottle test was the best way to find ones lateral thumb anatomy.
New drillers say bah humbug I hear and drill for the roll they want. I don't know how because I have a thumb that wants to go to my ring finger in the coke bottle test.
Any thing 1/8 or less under palm(Left for this lefty), leads to the Bill Taylor predicted double hang for me. One on the corner of my thumbnail down in the ball and one that rubs on the top side of the thumb on the other side! A big decrease in revs results, (FOR ME).
I tell my friends you want the ball coming off like butter. So smooth people think you are a no thumber some days! Or another look at it..."get your pickle(thumb) in that barrel(thumbhole), good and straight!
I've had acquaintances increase their bowling by going more under palm(while increasing reverse), and also had good luck with bowlers going lateral out(fewer), while decreasing reverse if their coke bottle test was near their index finger(out) while their barrel(thumbhole) was set up for a person with a coke bottle test near the ring finger. The old double pickle rub in the old barrel(thumbhole).
I still don't know how the new drillers take a thumb under anatomy and put it lateral out and get good results. I have seen a friend do it who was near 230, on a house shot and then go dramatically out with his thumb pitch for a more behind roll to improve sport results. He is now an elegant 212 house shot average and an elegant 196 sport shot average, maybe a slight increase on the tougher shot!
Thanks in advance for updates on adjustment methods from one's predominate anatomy.
Regards,
Luckylefty