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I should probably let the experts...there are quite a few...chime in first.

My guess is that a large ( 1.5 inch) stainless fender washer on the inside and a similar washer on the outside bent to a V will probably be all the reinforcement the repair needs to last many years.

My thought also is that the stresses on the bow eye can be minimized somewhat by backing the trailer an extra foot during recovery so that the winch has to tug just a tad less; and once home to release the winch so that the boat rests without tension on the bow eye for the time between trips.