.....but don't put a 20 degree knife in the 15 degree slot of your machine, that's bad idea IMHO
Interesting. The instruction manual on my new gizmo says 20 degree knives are ok and it will change them to 15. I suspect it is because it has diamond grinding wheels so wear on the wheels is not a huge issue but I'm guessing....... The "finish" stage of the sharpener appears to be a ceramic disc which I suspect is kin to the disc Tracy uses.