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What is Pin Placement and should I be concerned about it?
For the recreational and average bowler, requesting a specific pin placement is unnecessary. Your ball driller should be able to drill any pin placement ball for you to use. If a bowling ball driller says a ball can not be drilled, you should probably find a new ball driller, preferrably one that understands the physics of the new cores.
Now as you become a better bowler you will start to see certain lane conditions that your current bowling ball arsenal just won't do well on. Maybe you have one ball that seems to hook too much and one that doesn't hook enough. You should talk to your ball driller about the type of ball and pin placement to get you the ball for you. This is where you can start building your arsenal to handle any lane conditions.
Example: Some people will have more than one of the same bowling ball. Each one can be drilled to handle a different lane condition or oil pattern.
Below is a definition and example of what a pin is
The pin is a colored dot on the ball that signifies the position of the top of the core in the ball. With today's high-tech bowling balls, the ball driller must know where the core is in the ball.
When a ball is built, the core--anchored by a small rod--is suspended in a mold, and the cover stock is poured into the mold. When the cover material hardens and the ball is removed from the mold, the rod that was holding the core of the ball in the mold is removed. Now there is a hole in the ball that has to be filled, and it is filled with plug material, which on the surface on the ball looks like a dot.