Join Date: Aug 2006
Location: Arlington, VA
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Good suggestions, but the AT-120...and all other marine tuners I'm familiar with...come with a mounting bracket which maintains a good separation between the body of the tuner and whatever it's bolted to....automatically.
Mounting to a hull can be difficult, though. We often use special mounting studs which use an epoxy to bond to the hull, and include 1/4" studs for mounting. Depending on location, it's sometimes a good idea to bolt the tuner to, e.g., a piece of starboard and, in turn, bolt the starboard to the hull or bulkhead or wherever.
Drip loops on the wires are always a good idea, despite the fact that wire entries to the tuners are waterproof if properly fitted. It is a good idea as well to leave a "service loop", i.e., a short length of additional wire in case the ends need replacing/servicing.