I didn't think to take a before picture, but I saw your post earlier after removing the anodizing. I did some hand sanding with progressively fine sandpaper and realized that there were just too many deeper scratches and, since this is for a Frankenbike project that doesn't have any other polished aluminum on it, I decided to go with a satin finish that would look similar to other aluminum on the bike. I used a media blaster with low air pressure and walnut hull media to get a flat and even finish, then polished with Meguiars Ultimate Compound on 0000 steel wool followed by Mothers Aluminum Polish to bring them to a bright satin finish. The scratches are still visible but don't stand out like a zit on the Mona Lisa. I think they'll fit the current character and finish of the bike quite well.


Here they are after media blasting, with the non-drive crank polished, and finished ready for reassembly.

Thanks for all the advice and links.