Just bought a new Benchmade Contego CPM-M4 steel, RC 62-64. I emailed Benchmade to inquire about the angle their blades are ground to and was told (prompt reply) they use 15 - 17 degrees (30-34 inclusive). I assume that the 30 degree setting on my Spyderco Sharpmaker will do the trick if I ever need to touch up the blade (RC 62 - 64 !!!). What do any of you Benchmade owners use?