OK, so the boat I bought came with all new Ports
from New Found Metals. The cabin
is 1/8" steel, and the original ports
were installed in solid teak blocks that are about 10x10 by 1" thick. I think the ports are 1 1/4 thick.
I had overdrilled the holes in the steel to accommodate a nylon bearing in an attempt to isolate the stainless from the steel. But now I'm wondering if that's just paranoid?
The PO cracked a couple of the wood blocks getting them out, and now I'm a little perplexed trying to figure out the best way to install these things.
I'm thinking of milling out a backplate out of 1/2" starboard or something, then some insulation
and then a 'finish' panel of 1/4" or so???
Or would I just be better off forgetting the insulation
and putting in a solid teak block? (If I can even afford to replace the busted ones)
And lastly, I'm curious why NFM wants the trim ring installed with sealant
rather than just using butyl everywhere?