The instructions are pretty good, too. They were only in one language with no warning messages in sight. The stroke takes a little figuring out, basically you want to keep the stone moving side to side while it goes up and down. Setting the angle is a little funny, the holder is at
15 degrees to the jig, so when you put a protractor (I'm using the Ridgid Level app on my phone) on the stone, you add 15 to whatever the reading is.
Spend your time on the lower grits and get everything nice and flat and even. I spent most my time on the lowest stone, then when I got to the higher stones it took less and less time to remove the scratches from the last pass.
I'm not sure how I'm going to reestablish the angle when the knife needs touched up. They do show marking the edge with a marker then taking a very light pass to see where the marker is removed. If the whole mark is removed, the angle matches. I guess if I do that on both ends I'll have it close enough.
Puckdropper