Anybody Have One Of These?

As a wildland firefighter we sharpen a lot of chain. Cutting brush in rocky soil to make a fire line hitting rocks is inevitable.
Once you get a hang of hand sharpening you can attain perfection. Just find the worst cutter and sharpen that and count how many licks it took. Do the same number of licks on all the others. Repeatability is key. Doing both sides exactly the same prevents a j-cut.
By hand is more intimate and precise. Gives you repeatability and provides the best results.