As you can see, these other 2 gentleman are not cheap screws and their time is worth something...I am, well, lets move on!
I bought this probably 10-15 years ago in Pasadena? Who would have known you would need a chainsaw in Pasadena. And I got tired of having to drive 15 miles in LA traffic to find someone who sharpened them and at $8 a pop, that was a one time trip. A new chain was $15 at the time, that was unacceptable!
I now cut a lot of wood, my chains go dull in about 2 weeks. I also like a VERY sharp chain as I believe it just helps with safety, and I am more of a mayhem person. Yes it is a cheap product, it cost like $30 when I bought it, and I was surprised to see they had one in Harbor Freight with a few more features at the same price a few days ago. But it works real well! My chains are to be sharpened at a 25°, so it is easy to set my angle, 17° or 22° or 27° would not be as easy. (Maybe precise would be a better term)
I believe the experts would use a round file...Sorry that takes hand eye coordination and that is why I was a lineman.
Once a year, all this is probably a moot point for you. But I thought you might like another option. Alt and the + will make the instructions larger.