I have a GATCO knife sharpening kit with Diamond "files" in it. Coarse, Medium, Fine, the ceramic super fine... I hold the broadhead mounted to an arrow pointing away from me. I then work the "files" from back to front in one smooth long stroke. Depending on original condition or existing sharpness, I'll do 10 strokes, rotate then 10 strokes rotate then 10 strokes.... Then I go 9 strokes, 8,7,6,5,4,3,2, then one stroke rotate, etc. For several lighter strokes. They'll shave with coarse "file" all the way on down as far as you wish to take'em to Super fine or stropping.... Works great!