IF you have a Dremel tool, you can just
buy the sharpening bits. If not a dedicated
chain sharpening tool is pretty cheap to buy. I used hand files and it is slow.
Now with the dremel I can have a like
new chain in 5 minutes. Also next chain
buy a Stihl chain even if you have a non
stihl chainsaw, they seem to last
longer than the Oregon chains..