The New Reality of Drilling Symmetrical Bowling Balls 

Doc Do you think that maybe in peoples minds, that because the hook is brought up or back, to them that means the difference in shape? I agree w you btw, just trying to understand the opposing opinion.

Brian I think the reason why they argue this, is because they do not truly understand what ball motion actually is.

I also would like to know what he thinks. But I can tell you my thumb is unable to come out cleanly from any drilling any pro shop has ever done. The money I have spent working with many different pro shops is in the thousands. Don't get me wrong they are doing what is rite for normal people and it was rite for me when I was young. But as I've aged now 52 my average slowly dropped from 190 to 205 when young. To 170 to 180 last year and then my bowling center got a new oil machine and my average dropped to 150 160 range. I was ready to quit the sport I've loved for 40 years. I watched a couple of videos of people drilling balls at home. Here is what I do . Drill fingers first then put fingers in slightly stretch your hand on to the ball until the ball fits snugly across your entire palm. Now take a pencil and trace both sides of your thumb. Next mark the base of the thumb where you want to grip it. I recommend to try the first drill trying to keep all pitches straight. For me the thumb is way offset. Now here is what it did for me. I've been labeled as the biggest sandbagger in all of my league's. Because my average has shot to 215 to 220 and since this took place 1/3 of the way through the season with averages in the 150 to 160 range I've made a ton of cash. Now I love the sport more than ever.

In theory, an offset thumb drilling should make the ball sit in your palm better(easier). Your release will be faster providing the proper pitches are drilled for your hand. I normally drill 0/0 and adjust from there unless I know their thumb can clear their current pitches. Span is critical. I actually stretched my span 3/8” more. This caused me to relax my grip pressure a lot. Most of us bowlers have been grabbing our bowling balls for decades. Find a driller willing to work with your style, lane conditions and most of all watch you bowl. If you can find a driller willing to work with you, work with them and always stay positive. Change comes with time, patience and practice. NEVER practice for score, practice what you need to correct or become more consistent on. Good luck 🍀

In the dual angle layout system, the front angle determines where the cg is. You can make that angle anything you want. He’s saying you could make the front angle 180 degrees and it will still react the same, given the pin to pap and Val angle are the same

Not sure if you got an answer yet. If you polish and shine up a solid you can make it go longer later before it hooks, in theory. Same idea as getting a pearl version of a solid for transition or ball down

cg - center of gravity. VAL - vertical axis line

C is the geometric center of the bowling ball G is the center of mass of the bowling ball

This is called the Dunning-Kruger effect

Doesn't work in today's game