Straight from Mo himself.  --  JohnP

http://www.morichbowling.com/Drilling/DoubleThumbDrilling/DoubleThumbDrilling.htm

So anyone on this site have this drilling on any of their equipment? and if so what was the difference you observed?

Thanks
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"The framers of our Constitution believed that if the people were to be sovereign and belong to different religions at the same time then our official religion would have to be no religion at all. It was a bold experiment then as it is now. It wasn't meant to make us comfortable, it was meant to make us free."

motogp  send you a pm with a link to my bowlspace site with a pic of my Virtual Gravity that has a double thumb drilling.  


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" Lift Your Skirt Grab Your Balls and Learn How to Bowl "   http://coolluvr4u1976.bowlspace.com/

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The double thumb layout will always have a 4" pin to PAP and VAL angle of 30°. The Drill angle will be different for different PAP coordinates. You have work backwards to find out what the drill angle will be.

The PSA will be 1 1/2" from the edge of the thumb hole and the PSA will be 1/2" from the edge of the thumb hole. You should always spin a ball on a Determinator to make sure of the location of the PSA. It's not always where it's marked. I have seen them miss marked by several inches.

The double thumb can really increase the mass property dynamics of a ball. When Wlater Ray won in Hammond last season he was throwing an Intense LevRG with a double thumb this ball has a Diff of .056 and Mo tested the ball after Walter won and it was over .100 after drilling.

So you can see how much effect a double thumb drilling can have on a ball.

David Lee,

Looking at the picture of your Virtual Gravity I would say that is not a double thumb drilling. Yes you have hole near your thumb but dynamically the Pin and PSA are not in the correct location.

I have several balls drilled with a balance hole on the gradeint line with the hole in the P3 location and it looks like it would be a double thumb but it is not.

As any ball, a double thumb drilling can be a powerful addition to your arsenal if used at the correct time.
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Rick Guined

Owner/Operator: New Millennium Proshop: http://s239.photobucket.com/albums/ff183/Guined/
Vise PBA Regional Staff Player
IBPSIA Certified Technician
USBC Bronze Certified Instructor
www.viseinserts.com

The 3.5 to 5.5 is the suggested pin to CG distance. This is so you can get thumb weight in the ball after drilling so when you put the weight hole in it will stay within static legal.

Hopefully USBC will get smart and get rid the static weight rules and make life much easier for Manufacturers and Proshop operators.

Make sure you get your ball spun when it''s plugged, the PSA will be in a different location. A Determinator is the only way to find the PSA on a plugged ball.
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Rick Guined<font face=''''Arial''''></font id=''''Arial''''>

Owner/Operator: New Millennium Proshop: http://s239.photobucket.com/albums/ff183/Guined/
Vise PBA Regional Staff Player
IBPSIA Certified Technician
USBC Bronze Certified Instructor
www.viseinserts.com



Edited on 2/15/2010 1:36 PM

Edited on 2/15/2010 1:37 PM