Nick,

I cut/traced some paper templates to design a simple solution/cap for this - pretty easy stuff.

I do think I will have to tap into the cast to recieve 3 to 5 small stainless bolts. Then I will use a metal epoxy like JB Weld to backfill any voids between the stainless part and the cast. I do not think any adhesive on earth could secure this fix for even a single day on the water.

Dave