Dear tim,
Sorry, I emptied my head with the original message. No more; all gone.
All I know beyond that is that magnetic chucks are the platens of surface grinders, and they do exist.
I'll be glad to help, though; I have machinists. Who in heaven would pay for devices described in this ever-so-lengthy exchange. I'm out here -- I can't even pry a BrailleLite out of an old-friendly rehab counselor for a girl who is high-risk for 26.
Bill
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