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Uploaded on 4 April, 2013
The MOtion Hole Drilling
Very important points:
1. Layout the ball properly. For PAP’s less than 5 inches, the pin is to be placed above the ring finger with the CG in the Center of the grip. For PAP’s 5 inches and greater, the pin is placed beside the ring finger with the CG still in the Center of the grip.
2. Draw a line on the ball from the Center of the thumb hole through the pin.
3. Extend the line 10 inches past the pin to the bottom of the ball and mark that spot. This in the intended location for the hole.
4. Place a piece of white tape on that spot. Throw a few shots to ensure the ball does not flare over the tape.
5. If the ball does flare over the tape, move the tape sideways to miss the track flare.
6. Drill the hole 4″ deep, starting with a 3/4″ diameter hole. Increase the diameter of the hole up to 1 1/4 to increase backend reaction if desired.
The motion hole was designed to create a very strong backend reaction on symmetrical balls. Our test ball, the Radical Yeti without the motion hole has a very strong arc reaction downlane. It’s very predictable but does need to get to the dry. It blends out the dry very well and makes a very strong arc to the pocket, but if kept in the oil it does tend to squirt a bit. We were lined up throwing 14-5 with no motion hole.
We did start with a 15/16″ motion hole and tested it and then drilled the 1 1/4″ hole. Unfortunately the difference between the two was very minimal. So we decided to show on video the largest hole vs no hole.
On the same line that we struck flush with on the ball with no hole, the change in reaction that the 1 1/4″ motion hole creates is immediately obvious. The ball cleared the heads the same, read the midlane very similar, but revved very hard at the breakpoint, seeming to hook a few feet earlier and hooking much more on the backend. The ball went thru the nose, almost Brooklyn. To get lined up again we moved 5 boards left with our feet which resulted in about a 2 board difference at the arrows and about 3 boards more right at the breakpoint. The ball was no longer smooth off the breakpoint. When it hit the dry, it looked like someone kicked it left. It really reminded me of an assymetric reaction. Because it hooks a bit earlier, the motion hole also created some room left of target. It checked up in the oil much better than the reaction with no motion hole.
My concluding thoughts are this: the motion hole definitely drastically changes the overall reaction of the ball. It gave us 6 boards change in overall hook with the 1 1/4″ hole. The difference in backend reaction makes it look like two different balls. It would seem that the motion hole does increase the differential of the drilled ball. This layout gives a bowler options when drilling a new ball. The average player looking for maximum backend reaction can now achieve it with the addition of the motion hole.
The opinions expressed are solely those of the writer and not of Brunswick Corporation.