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So the minnkota brackets always come with stainless bolts. Do I use stainless rivnuts then or aluminum?
There are two lines of thinking here. Would you rather have dissimilar oxidation between the hull and the rivnut, or between the rivnut and the bolt? I like stainless rivnuts with stainless bolts for the load bearing things like trolling motors. A little oxidation between the hull and the rivnut seems the lesser of the two evils to me. They are expensive, so I have been using aluminum rivnuts with stainless screws for the smaller things. If rivnuts are ripping out, I would think that they are not installed properly, or the hull is too thin to use them? I have only had one spin out, and I wasn't the one who installed it, so I can't tell you if poor technique was a factor in the failure.
 
I used aluminum rivnuts with stainless bolts BUT i also used anti seize on the bolts.Ill run like this for a few months then check them for galvanic destruction, No-lox might be a better product to fight dissimilar metals.Have never had a rivnut let go as of yet.
 
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