I am trying to add fine jimping to my bk24. The D2 steel is pretty abrasion resistant and skates off any files I have tried to use. I have been searching for a triangular file hard enough and sharp enough on its edges to create the jimping I am after and think the spyderco sharpmaker triangular rods might do the trick. To get an idea of how sharp the corners of the stones are and what kind of jimping it might be capable of, I would really appreciate it if someone could file a small notch or two into a penny or some other soft, easily recognizable object. Also, if someone happens to have one of the spyderco ceramic files and could do the same, I would appreciate that as well. Thanks for looking.