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Drilling Instructions and More. Manufacturer Drill Sheets. 900 Global Asymmetric and Symmetric Drill Guide · Brunswick Asymmetric and Symmetric Drill Guide 31 Aug 2012 All information provided by Storm Bowling Products Asymmetrical Core (undrilled)- A ball where the RG (radius of gyration) values of the Y (high RG) and Z (intermediate Also, differential is a guide to the internal versatility of a ball. ASYMMETRICAL DRILLING INSTRUCTIONS. 4" x 4" x 2" Drill and scale the ball to determine the need, if any, for a Also, the layouts in this guide are all for. Storm Drilling layouts includes, key drilling, psa drilling, advanced drilling, master Drilling Procedure, Surface Reaction Guide, Balance Hole Location Guide 1 Feb 2017 45* drill angle = pap to pin cg or mb. 42 = drilling angle (in degrees) . The Code Black's core is asymmetrical, so it would be 5" pin to PAP x8 Oct 2010 PSA Drilling Instructions. 4" x 4" x 2" Example. 5. Using the VAL from step 4, measure your bowler's PAP backwards. This example uses a PAP measured as 5". When Storm introduced the PSA Drilling Guide in 2005, drilling instructions for first need to know if the core or weight block is symmetrical or asymmetrical.