On 04/05/2021 15:15, NY wrote:
It never occurred to me that it *might* be possible to sharpen the
blades on a chainsaw chain in situ, because of the problem of rotating
the chain slow enough to do each tooth in turn. I suppose if you mark
the teeth that are exposed and that you have sharpened, you can run the
chainsaw and stop it - and hope that sooner or later it will stop with
different teeth exposed.

Some chainsaws you can pull the blade round by hand, dead easy.

Bill