Per the ’76 special tool catalog the #380657 (which can be seen in the pic) is used with slide hammer #380657 to remove propeller shaft bearing cup on 1974-76 9.9 & 15 hp models. Also removes bearing assy #379503 & needle bearing assy #379505 from 1966-68 100 hp outboard gearcases. Also used on stern drives with same applicable gearcases. That’s straight from the book.
I have used mine for all kinds of other stuff. It will pull almost any seal you can stuff it into. I have another one I have modified so it goes into a smaller hole. Neat all around tool.
Dan in TN