[quote=tominpa]Be careful of mixing metals since you are on saltwater. Aluminum readily corrodes and gives up electrons to metals like bronze. If you can find aluminum bushings or spacers, they may be better since you are on saltwater and will solve your wallowed out holes without putting dissimilar metals in direct contact. I have a monohull sailboat that had some wallowed out holes in an aluminum rudder head, and used aluminum spacers with a 5/8 outside diameter and 3/8 I.D. that fit the the 3/8" stainless bolt perfectly. With saltwater, there is a galvanic potential between aluminum, and other metals that are lower on the galvanic chart. That may have been part of the corrosion you found. Aluminum alloys are at -760 to -1000 on the galvanic chart, and bronze is way down the chart at -340, which would make these a bad combination in the long-run. Without getting into it too deep, just look at Table 1 of this article [url]https://www.boatus.com/seaworthy/magazine/2015/july/marine-corrosion-101.asp[/url][/quote]
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