With a 5 inch pin, the farther you put a mass bias in a ball from your axis, the more backend you will get. Ex: Putting the mass say at 3 1/2 is going to get the core to rev up in the midlane a bit, so it will have more of a roll at the breakpoint. When you put the mass at 5 1/4 - 5 1/2, you will get more of the skid/flip type of reaction. For heavy oil, take some polish off the ball and go with a 3 1/2 mass placement. Once the lanes break down a bit and to get the skid/flip, polish the ball with some Clean n Sheen or Magic Shine and go with more of a 5 1/2 mass placement.
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Steven Vance
Atlanta (Buford), GA
Pro Shop Operator
Advanced Bowling Solutions
If anyone out there is worried about the scores being too high, try duckpin!!