Before one ever considers plugging and re-drilling a ball needs to try cover changes first.
Go to your local Walmart and buy some Green scotchbrite. This is 600 grit.
I feel it's a good idea for all bolwers to buy a set of abralon pads. This makes changing the cover a lot easier. Get the 4000,2000,1000,500 pads. They really make it easy to fine tune a balls reaction.
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GO BEARS! Super Bowl bound!