Today I sanded my swing arm to remove some of the light scratches and blemishes that have appeared over the time I have owned the bike. The swing arm has a very polished look to it now that actually looks cool, but I really want the look of the original swingarm, the more dull look, I have tried different grits of sand paper also, but it either scratches with coarse or polishes with fine. I was wondering how exactly I would acomplish getting the aluminum to a more dull finish. Any ideas??