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Marv,

Thanks for the info.  The composite firewall is only about 7/16 inch thick
(1/4 inch plywood covered with fiberglasss, two compressible layers of 1/8 in
fiberfrax and the thin stainless steel firestop).  Probably a 2.5 inch long
5/16x18 threaded rod (about the thickness of #4 wire) with the center 1/2 inch
unthreaded  would do the job.

Today I talked to a person familar with boats and he said he has seen similar
brass terminal posts.  I think brass or a brass alloy might work, but I want
to consult a conductivity chart first.  Also, whatever is used must withstand
vibration and a torque load of GOODNTITE.   Tomorrow I will try to check with
"boat people".  (Yes, we have them in the Midwest)

Scott Krueger
N92EX