Two-Handed And No-Thumb "Triangle" Bowling Ball Drilling Layout
Recently, USBC updated their rules regarding balance holes and thumb holes for bowlers who don't use their thumb. No-Thumb and Two-Handed bowlers (who don't put their thumb in) were both affected. Essentially, bowlers who don't put their thumb in the ball can either have a thumb hole or a weight hole, not both.
These changes seriously limited drilling layout options for these bowlers... until now. A certain layout has recently caught some steam. We've been using a variation of this since the 90's for No-Thumb bowlers. I'm referring to the “Triangle” drilling layout.
As you see in the image above, this layout features 3 holes drilled in a “triangle” pattern around the Center of Gravity (CG). This allows for 6 different layouts in the same ball!
Here's how to lay the ball out:
1. Draw a line from Pin to CG.
2. Draw a line 120 degrees from Pin to CG line.
3. Draw a 3rd line, 120 degrees from 2nd line.
4. Draw 1/4” bridge on each line.
5. Drill 3 finger holes, each touching 2 of the bridge lines. Drill holes with 3/8 lateral (away) pitch and 0 forward/reverse pitch. All 3 holes should be drilled with the size for the largest finger (This will be the middle finger for 99.5% of bowlers).
So, what are the 6 different layouts created when you use the Triangle layout?
If you refer to the image above, here are the layout variations:
1. Pin at 6 o'clock
2. Pin at 10 o'clock
3. Pin at 2 o'clock
4. Pin at 12 o'clock
5. Pin at 8 o'clock
6. pin at 4 o'clock
The pin to PAP distance on each variation will vary based on the bowler's PAP. For more detailed information and to see a visual demonstration of the info presented in this article, please watch the video below.