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This is how I mark mine.
Use a small triangle file.
Cut one narrow v shaped notch in the "1" position of each wheel.
Cut one wide (use a flat side of the file instead of an edge) in the (2) position of each wheel.
Cut two narrow v shaped notches in the "3" position of the ball wheel.
Make no marks on the "0" positions.
You can then read or reset your counter without taking it out of your pocket or ball bag.
Roger Greene
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