I think it also depends on how hard you are on your motors and what brushes you use. I use Reedy767's mostly and find they are very kind on the comm and only ever skim at home but general get the comm stick out to remove any carbon buildup on the comm between runs. When I ran LRP brushes for a meeting last year, they were realy harsh on the comm and I ended up having to re-skim and brush every run.....
The reason why we skim a lot more now is that we put far more power through them pesky motors than we did even in '97.
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