many older c&c s built early 1970s especially custom builts have aluminium chain plates ..the advise you have from yard is not to helpful....their answer is to replace with stainless? they are stainless steel workers? most aluminum used in key areas is aircraft specification...one of original founding companies ..belleville marine and their associate companies were aircraft parts mfg &used aircraft spec. aluminum for aircraft as well yacht building....most of the smaller aircraft still operating just fine ..this spec ification of aluminum will show some white scale under certain conditions but not generally any corrosion which is structurally significate.....do you see any eaten away aluminium?...is the chainplate moving or still strongly fixed?is the leak you had repaired still leak? ....probably the only real risk is water getting into wood backing plate or fiberglass...this can be fixed very easily even by a person with 75plus year old hockey knees...i know..it is quite possible little needs to be done..i would be interested what year and model the yacht is & may be able to check info in more detail....where is yacht located ? DONT GIVE UP THE SHIP YET....for i understand bingo nights bouchart gardens not very good substitute... redline 41 ,1968 south vancouver island.
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