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on the topic of bolts, why not just run the wires through the firewall and
forget about it? get a good grommet to protect the wires.

also the electrical resistance of steel rockets up with hardness, so those
mil spec bolts you we use have very little conductivity. I work in the field
of high pressure research and we are always trying to find ways to pump
2000-4000 amps through high strength materials. also, brass bolts will
change conductivity with very minute changes in composition and hardness.
shunt check your resistance carefully before you use brass bolts, or
anything else.

Scott Dahlgren