Sir, I would go with a stacked drilling, 2" pin, something around a 4 - 4 1/2" stack, i.e. 4 x 4 or 4 1/2 x 4 1/2. Use this drilling on the Black Cherry if you're not getting the Blueberry. If you're getting both balls, then I would drill them both the same, using the 4 1/2 x 3 layout. =:^D