Dons method is actually better, as the brush would grab the 4-0 wool no problem... and all is as soft as non ferrous (I know the steel wool is steel!..

) ..... a few cycles in and out, job completed!..... Oil is a good idea as well.... tomaustin, I don't have any pics, but I have used split mandrels for just about ever bore polishing task one can imagine?.... for about 40 years! Just take a round aluminum rod, or even wood dowel, cut a slot, and get after it!... results are amazing? hurts nothing! til...lat'r...GT...