Support BladeForums! Paid memberships don't see ads! I've searched and read about all of the CR sharpening threads I could, and have decided to go with the Spyderco Sharpmaker to sharpen my very small collection of CR knifes. (I've sharpened freehand before, using oil stones for what essentially is a straight razor, but it was a long time ago and I don't have time to re-master it. The Apex and Wicked Edge systems are just too much for me at this time.) I picked up the Sharpmaker and a set of Ultra Fine rods, and they should be in soon. I'm not trying to preserve the convex factory edge, so I need to establish the 40% edge. I'll be sharpening an Unfaam, small Inkosi and a Mnandi. I had a few questions: If the knives are still reasonably sharp, I can I just use the fine or ultra fine rods to touch up the factory edge? Corner or flats? I know I need to avoid "rounding" the tip. If I want to establish a 40% edge, should I start with the brown stones? I'm assuming that the diamond stones would be overkill, but would be interested in anyone's thoughts about that. From what I've read, it may take time to "flatten" the convex edge to a "v". Any recommendations for a cheap (but decent) practice knife that with a blade shape/grind that will provide a good substitute for the blade on a small Inkosi? Many thanks in advance. This forum has been a fantastic source of information.