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Originally Posted by donv
Great idea by the OP, much easier than the big plate approach. One note for folks that plan to follow this route: steel + aluminum = galvanic couple... the aluminum is most likely going to corrode at the contact point with the steel clamp. A piece of thick lexan substituted for the aluminum would likely provide the same mounting strength but no corrosion risk.
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The steel is chromate plated (that's what gives it the yellow tint), the aluminum is completely compatible, no need to worry about corrosion.
http://www.engineersedge.com/galvanic_capatability.htm