Ah, I recall now. I substituted the first took for a few blocks of metal on several sides of the gear. I think I did the second by putting the seal in before assembly.
A writeup would be pretty awesome if you find yourself motivated one night. I have been surprised with so many of these in boats that such a writeup does not appear to exist (at least according to google). Would be interesting to see how other people do things, might help me figure out whether or not I did something to cause this failure.