Another source of polishing would be to use a case tumbler
used to polish cartridge cases when reloading ammunition.
Walnut shells or ground up corn cobs are used as media, and
are available at sporting goods stores. I haven't tried
aluminum in my tumbler, but brass certainly comes out nice
and shiny. (Incidentally, although called tumblers, the units
I'm talking about are more of a vibrating tub than anything
73, Arliss W7XU
> One very interesting bit of info was received on how USA
> manufacturers polish the plates and round the edges by using
> a mixture of walnut shells in a tumbler. Now if a guy had a
> jeweller's "rock tumbler" and the right polishing compound (like
> some crushed walnut shells) that would be interesting to try!
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