I,am refitting a 1982 Cabo rico
,the Perko ports
are secured by tap screws into the coring for strength,The out side has a trim ring which also acts a sealer for the caulking.it is aslo taped into the coring from the outside.Thus they are not thru bolted.I,spoke with a metal shop today and the ablity to make a full sized trim ring is available,Thua allowing thru bolting.
Any ideas on which material to use Bronze is out of the question since the Ports
a forged.Stainless,Brass,or Copper that is the question.
Strength is not really an issue as the rings will only have compression
and will be secured with sex bolts.My curiosity is any experience with ageing which will match the bronze as the rings age.
Any and all views wil be apppreciated.