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When wiring up my L-235/320, I bored a 1 1/2 inch hole thru the firewall and
bolted a phenolic plate over the hole (overlapped and RTV'd).  Then drilled an
individual hole for each wire through the phenolic plate and continued the run
to the appropriate component in the engine compartment.

I also ran a few extra pairs with sufficient length coiled up and tie-wrapped
to the engine mount - with the other end tie-wrapped behind the panel - for
future applications and as spares (just in case).

Once finished with the wiring, I RTV'd the bundle on the firewall side and off
I went.  Pretty simple and no chance of any wiring connection coming apart at
the firewall.  Probably could have gotten away withoug doing the RTV.  

If ever a starter wire or alternator lead has to be changed (not very likely
at all), well then I guess it would be a fairly big project but can't immagine
this ever happening.

Pete Cavitt - N320PL
619-283-7473