I thought I had mentioned that I was using a buffing wheel on a bench grinder. I use it on aluminum slats for my chairs all the time. I use a real fine buffing compound that we use for woodworking called rottenstone (really fine pumice slurry) that has very little abrasion, but really brings a shine. Thats why I said I can't really get by sanding scratches.
BTW is that pic of the little belly gun you had posted a while back with the walkthrough? That is sure going to look nice on the brass frame.
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