I sharpened a bunch of new style and old style Grizzlies last week using a home made technique because my old method hurt my rib injury. I screwed a slotted piece of hardwood to the side my picnic table, took a wedge shaped chunk and fastened a new Grizzly file to it with screws and washers. I set the arrow so that the broadhead was supported at the corner of the slotted piece and at the angle I needed and clamped it in place. A home made wood KME system sort of. Controlling that angle and pressure is everything, they were shaving sharp with just file, a little better yet with the proper filing flat of the back, tweaked them a little with a diamond hone, then made them smooth with a leather strap. I can shave hair with no snagging off my arms. A KME knife sharpener would have been easier, but I wanted to test the system before I bought one for myself, it works for my single bevel Hills as well with a slight modifications in the techniques. Next year I will be using a real KME system.