My boat's serial number is 808 but date of manufacture is unkown , any suggestions? Also , the turnbuckles on the standing rigging are bronze. I once lost a mast when a bronze turnbuckle on the forstay blew out bucking into a big headsea. I'm thinking of changing them to stainless but an old timer told me if they were phosphor bronze that they would be stronger than stainless. Anyone able to answer that one?