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A good way to secure 'through the fire wall' cables is by using an
electrical fitting used to make 'water tight' cable connections into
threaded junction boxes.  They consist of a threaded male end (1/2" npt for
this application) for through the fire wall, and a threaded compression
fitting on the other end that compresses a rubber gland around the cable
sheath, making it leak tight, secure, and still encased in rubber for
vibration/flex dampening.  When I was active in the electrical business, we
called them 'CGB' connectors.  Not sure what their recognized trade term is
today.  You will need your cable diameter to select the correct gland
internal diameter.

For fastening in the fire wall, either thread a piece of phenolic block or
use the locknut that comes with the connector, and simply put it on the
other side of the fire wall.  I think the threads are long enough.

Gary Rodgers

LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.