I agree with Jim. In fact, if my memory serves me, he's helped us with a few issues in the past.
In regards to your tumbler idea. Go buy a cement mixer. We use one for all of our production steel parts. It will also work for alum., but not as well. They are alot cheaper than an actual parts tumbler, and basically do the same thing. For steel parts, you don't even need to use a median like sand or glass beads. If the noise gets to you, roll it outside or line the mixer with rhino lining.
Mike |