skwerl
tree hugger
The guides made it helpful for the angle. We also used to nip the tooth in front of the cutter that set the depth. That made the chain go farther once it started to really wear out. Not too much or that fucker really jumps LOL
That's the depth gauge or 'raker'. You want them at .030" to .035" depth measured from a straight edge laid across the tops of the cutter teeth. I usually just eyeball them and hit them with about 2-3 swipes with a flat file every 3-4 sharpenings.
Use your bench vise to hold the saw bar when filing. It helps tremendously when you don't have to hold the saw steady while working on it. I'm so lazy that I mounted a vise on my bucket truck for sharpening my saws during the day.