Thank you Mo. Will do as you say. Should I also try a fake vacu lady oval on the RF to deal with possible swelling or just keep it with no insert? I think RF hole was a little to tight on the sides.

Ok, bowled 2 games at lunch time then an hour after work so here's my feedback: First swing almost hit my forehead, mantra: do not squeeze... After that it felt very good, actually got my track closer to my fingers (a good thing) Ball reaction was great, was carrying on the dried up THS... After bow...

Spans and pitches were made exactly to Wiki fit: -Fan Chart: 11* (Simplified version using my ball) = Line A -MF 3 7/8" Measured with current ball (thumb fully inserted) and verified with Innovative Fitting Ball -RF 4 1/16" Same as above -MF 70* Normal Flex, RF 45* Slightly Stiff (-1/16&qu...

Thank you all for responding, will drill the ball today and after I bowl 6 games will report back.

Thank you for the fast response JohnP! Thumb is always fully inserted. If MF is 3 7/8" and RF is 4", thumb flex is 90*, should I use 3 7/8" or 4" on the thumb pitch chart? Edited: Ok, found this thread that answered my question about which span to use when calculating thumb pitch...

Hello my name is Antonio, I am from Puerto Rico and have been reading this forum for a couple of months. First I would like to say thank you to Mo and others who contribute such a great wealth of information, you all really show love for the sport and willingness to share your knowledge and I am gra...