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Keel bolt issue
While I agree with you that keel bolts should be threaded at both ends so that the keel bolts can be easily removed for replacement, they almost never are, at least since the mid- 1970''s. Since then keel bolts have generally been a ''J'' shape and cast into the keels. Tobin bronze is great for lead and passable for cast iron but will electrolysize rather quickly with cast steel as was used on the boat in question.
Jeff
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