Ahhh, sanding, how do I love thee? About as much as poll tax actually, but it's got to be done. A chunk of Medium paper, wrap around the arrow, a slightly suspect up-and-down movement and keep the arrow rotating all the time to keep it even.

Stay away from the tapers!

Some Airbourne on in the background to get me through this bit.

Be gentle with the sandpaper. It doesn't take a lot of effort to smooth off a couple of grains, but it's a hell of a job to put it back...

All down to 312 grains - except the first 4 which are 310 to match up with the four piles which came out as 102 grains. Natch.