The boat is a 1988 Brewer Three Seas 40. The entire strut, including the custom cast part that matches the hull is stainless. The cutlass carrier was welded on, and as you can see, the corrosion is just to the side of the weld. I don't have anyway of knowing what type of rod was used but for some reason that is where the electrolysis chose to attack (in my experience that is also where welds usually break). Two SS welders that I had look at it have seen this before (apparently SS struts are common on large power boats), immediately said it must not be grounded and they were right.
Replacing the whole strut and having a custom bronze one cast sounds like it might be a little expensive so I'm hoping it can be welded (after grinding it out with a die grinder it actually cleaned up really well and looks like solid SS to weld to). I'm keeping my fingers crossed.
SV Laurie Anne
1988 Brewer 40 Pilothouse