edit: Never mind, I re-read your original comment. Yes I agree that making major changes is less of a paradox. Never mind. I'm surprised also by your take on t

edit: Never mind, I re-read your original comment. Yes I agree that making major changes is less of a paradox. Never mind. I'm surprised also by your take on the paradox. I've always understood that the difficulty lay with the use of identical materials to replace the old ones. It might be clearer to consider the similar formulation of 'Trigger's Broom' from the show Only Fools and Horses on UK tv. Trigger has the 'same' broom for years, despite having replaced the head several times, and the handle several times. Clearly the same materials are used here. I would say that replacing the wooden planks with metals ones is less of a paradox - that is more clearly a different ship! Replacing the decayed planks with other decayed planks makes no sense, so I don't understand your perspective on this ...