If you use a machine of hand file things that may be of use. Never let the teeth round over otherwise it will take ages to sharpen them back to straight part. and secondly don't forget that the depth gauge also needs grinding down to the correct depth, when grinding with a machine be aware that you don't make a large burr they can be knocked off afterwards but a pain.
How do I know all this, after sharpening from 6 chains and upwards a day you get to know these things
Yes I use to service and repair them as well as demonstrate
