What is suggested on the Rico pattern and what I've used with great success is below from
http://www.brunsnick.com/rico_ball_layout.html the site has pictures as well.
In an asymmetrical core ball, the pin is put in the center of grip, with the PSA (or mass bias) 45 degrees from your PAP. It would be ideal to find a ball with the CG inline with the PIN and PSA for this layout because of the X-hole location. The next variable with an asymmetrical core ball is whether or not to drill the X-hole 6 3/4" away from the PIN, which would drill through the PSA locator. Personally, I don't believe in drilling out PIN's or PSA's, but some folks do. Instead, I choose to measure 1 1/8" towards the PIN from the PSA and put the X-hole there. This will alter the measurement to 5 5/8" from the PIN!
The X-hole size can vary depending on the starting top weight of the ball. Generally, 2.5 - 3.5 oz is ideal for this layout. Using a 1" bit, drill 2 1/2" deep for your X-hole. Doing so will bring the ball back to USBC specifications for side & thumb weight, as well as raise the bowtie for your track flare. Lowering the pin will lower the track, which may cause flaring over the fingers. The X-hole will raise your bowtie up, eliminating tracking issues.
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