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I think Carl throws them away when they get dull because he can't use a hand file yet. :lol:

A guy I used to climb for has been doing tree work for over 15 years and has never replaced a sprocket on any saw.

I don't know how to say it other than just replace it when it's worn. Kind of like trying to define how often one should replace the tires on his truck, you just look at it and replace it when it's worn out.