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Help!

My 320 electrical scheme includes passing power and ground thru the firewall
via non-ferrous (copper alloy) bolts scrounged from the terminal posts of a
master relay.  This system is used because it provides for bus connections on
either side of the firewall while also providing a seal between the engine
compartment and the cockpit.  Non-ferrous material is used so that no
magnetism is created as has been reported when steel bolts are used.

Because these are short bolts, I cannot use enough nuts to lock the bolt onto
the firewall with a certain pressure and also securely fasten to terminals to
either end.  Also, I cannot over-torque the + bolt for fear of breaking the
phenolic T-bushing used to isolate the circuit from the stainless steel
firewall.  I believe the lack of a "good" connection is causing minor problems
under the vibration environment during flight.

Does anyone know where I might obtain non-ferrous (copper alloy?) threaded rod
material or a solid rod of a bolt diameter that I could thread?  

Scott Krueger
N92EX