Thank you all for your responses.  It was pretty much the answers I
expected, knowing the more robust chemical resistance of epoxy resin.  My
initial internal response was to make the fixtures out of stainless steel
(rather than aluminum), so more aggressive solvents could be used, but I
wanted to make sure that I had not missed an easier solution which would
allow me to make changes in the process without changing certain drawings.
It kind of goes along with what Steve Gregory said (sans hillbilly lingo)
"there must be a chemical solution out there".  I didn't think there was.
Thanks.

Doug Pauls
Rockwell Collins
"If ya can't rock well, don't rock at all....."

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