I had some 80 grit standard sand paper I tried. It worked fine, I just hit it with some finer grit by hand afterward. I may try some 120 to begin with.
I initially had tried to use adhesive on the aluminum. It was kind of a pain. I then hot melted some files to the metal, but they didn't cut the wood very easily (a double cut file might have worked better).
There was a clip of a guy using a jig on another site who just put the sandpaper underneath the corner stock and tightened it down. It works really well. The piece of sandpaper that is against the arrow is loose, but it doesn't seem to matter.
Getting the jigs set correctly is kind of a pain, but if m midd can do 3 dozen shafts on one piece of sandpaper, I guess it won't have to be done very often.