All done
Thanks all for the constructive advice.
Guess there had to be a downside. Yes, the aluminum ground off like butter, but interestingly did not clog the grinder wheel. I could see why that would be a discouraged practice, especially in a shop.
The dremel bit, however, did clog up right away. I switched to the flex extender and spun it down way slow, using a large cutoff wheel to finish the inside of the exits.
Anyway, perhaps the better approach might have been a diamond cutting wheel on an 18V circular w/ depth control. Recall that the key was that the mast is up, and lines, wires are alive inside.
Thanks again for the contributions.
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