Old boats need some ingenuity to keep running. This is the sea water pump for the engine, which provides cooling water to the heat exchanger. When I replaced the impeller this season, one of the bolts stripped the threads on the pump housing. (I hate it when that happens!) The impeller needs to be replaced every 100 hours of operating time, so these bolts get used a lot.
Parts for old engines become scarce and expensive. This pump can still be replaced for about $600. I figured it was worth a try to tap new threads into the housing for an oversize bolt, and in this case it worked beautifully. Now, I'll just reinstall the pump and it should be good for another few decades.
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