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Old 01-05-2013
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Re: best way to mount Aluminium to steel underwater

xymotic:

I think welding a nut onto your hull is overthinking it a bit.

I'd probably be inclined to treat the light as any other below-the-waterline through hull. Pick your location, drill your main and bolt holes, bed the puppy with a liberal amount good sealant, and through bolt it. Since your hull is steel, lock washers and hex nuts should be sufficient.
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