Hello group, I have access to an echo 590 chainsaw, the manual says it has a 3/8 9.53mm pitch chain, I am researching chainsaw blade sharpeners and I see a Shihl and knock off sharpeners but none show a 9.53mm pitch they seem to be 4... I don't understand this. I also see electric, manual files, and attachments. I even see a harbor freight grinding sharpener that looks interesting. Can anyone explain what would work? I am going to be cutting many trees on an 8 acre property in New Haven CT I don't know what type of trees but they go up to 100' and no I am not going to cut that size something in the 20' and less size. Thanks in advance.