On 13 Jul 2005 20:49:26 -0700, the opaque "Bob AZ"
clearly wrote:

You might rig up a blast gun and use a cleaning powder called Bon-Ami.
Then you can control the blasting/etching as you see fit.
I can make a drawing of a blast gun and FAX it to you if you would
like.

That gun is a likely candidate for the dropbox, Bob.
www.metalworking.com/dropbox.html

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