Just wanted to clear up how I use the file. Some on here have suggested using a file and stroking it across two of the blades. Not saying this won't work but it is very difficult to maintain the proper angle free hand. I use the largest Mill
Bastard file I can find, 14 to 16", lay it flat on a hard surface and put the Broadhead in some type of holder( old arrow shaft
Or similar ) and stroke the head down the length of the file,
Rotate and repeat.
By doing it this way, Broadhead always remains level and
Each stroke is the same. Hope this helps. Have used this method for many years on many different 3-blade heads, never found one it wouldn't work on.
RW