Anyone tried something like
this? It's a diamond sharpening stone I just bought, however I have trouble getting a sharp edge. I have a traditional sharpening stone which works great, but I got this new one to save weight.
I've noticed that there is a tiny metal protrusion on the side, so I avoided that area when sharpening but still I can't get a sharp edge. I use it just as my old stone: spit and rotate. Am I doing something wrong or is this just a bad product?