Bret4207
ArboristSite Guru
Will do.
Different hardness metal on the same chain ? That's what it feels like, but it seems unlikely to me ? Just asking.
The cutters often develop localized hard spots. I don't know for sure but I think it's work hardening. Plus if you "rock" a chain you'll embed grit in the tooth that you have to cut away. A sharp file will cut through it. Sometimes you'll get a chain real hot and set it in the snow and it hardens the chain, at least the outer surface. A grinder is sometimes required to straighten that out. Of course if you don't cut filthy, gummy wood you may not have that problem.
I really like the roller guides. I have a few of the originals (Pferd I think) from the early 80's that used a hardened steel roller. The new types are a lot easier on files but wear after some time. I just pick up a new one and am a happy camper again.