I went with a friend the other day to help then finnish up a job they were on cutting pulp wood.. my friend was telling me how this guy they work with can really sharpen a chain well. he got him to sharpen his saw while we watched so i could see how he did it .. i never seen anything like this before..he filed at at a 25 degree top plate angle roughly . .and free handed but he held the file handle in about a 45 degree upward angle on the handle or darn close to it and put a hook in the top plate he said to me that you need to have that hook like that.. or it wont cut right .. he wanted to do it to my brand new chain for me .. i quickly said no thanks ive already sharpened it . No way am i going to let someone run a file down my top plate like that.. after he hooks the top plate though he he finishes off with a few hard strokes with about a ten degree upward angle on the file holder. and for some reason after going all of this to it it actually appears to cut decently . there was a bit of chatter but i think my friends rakers were down a bit far to begin with . just wondering if anyones seen that done before ? the guys been cutting pulp wood for 15 or so years. Does he know some kind of trick ? or has he just never learned the propper way to sharpen a chain ?