hey guys i was just wondering if you could explain how the decorative filing on japanese blades is accomplished. Yes, I do know it is done with the file and I have done perpendicular file marks using the corner of a file but there must be some trick. Whenever I try the file does not cut a straight line or it skips. I really want to know how to do the "Kesho" pattern. If you look at some howard clark blades and nihonto the filing is near flawless! Thanks!