I have, and have used, exactly the same saw set. For those who have never sharpened a hand saw, after you file the whole length of saw teeth even, you sharpen the teeth themselves with a triangular saw file, one side and then the other. When this is done you have to "set" the rake on the teeth, so you turn the dial on the front of the tool to the number corresponding to the "teeth per inch", and push each sharpened tooth over to give them the proper rake. Like the sharpening, one side of the saw blade and then the other. It's pretty much a lost art.