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I think what he is saying is that it shouldn't have to be done at all, unless something bad has happened between where the nut is and where the bolt emerges from the keel. If your nuts are loose, they either have backed off or your hull is thinner than it used to be, or the bolts have stretched.
That would seem to go with my original suspicion, but I would not trust my judgement over other's in the matter.
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