Thanks for the answer, but I guess I don't understand it. But, I'm only running a Stihl 031 w/ 20" bar. wink

It was something similar to this that was scribed under the brim. What are those measurements and where do they come from?
Quote
A tree with a 13'-67",13'-62",13-60",13'-53",14'-50" and 14'-44" ...


If you take the time it takes, it takes less time.
--Pat Parelli

American by birth; Alaskan by choice.
--ironbender