For some reason, this has popped up on my computer screen for years and I know just how hard the steel in these jointer knives is, I was quite sure IF this worked it would be tedious at best. And sure enough, not only was it very hard to figure out the correct angles, it was even harder to make sure the slots where the knives are inserted, that they were exactly the same depth so that all the knives align, and then it came to actually try to sharpen them with a stone. As I expected, not a go.
