A friend of mine bought a Spyder edge Delica in ZDP189 and was wondering how to sharpen it with the steel being at such a high Rc rating and being serrated. I have a Spyderco Sharpmaker with the standard coarse and fine ceramic rods, and he has the Lansky crock stick setup with the fine and coarse rods so would that be enough for a Spyder edge ZDP189 Delica. He said that he will not really use it all that much but if he wants to touch it up would you recommend something more than the sharpening systems listed above.