Assuming there isn’t any water in the gear case is a big mistake.
You should realize there is always the possibility water has entered
a gear case until you have drained it. I have found motors with prop
shaft gears that are prefect on one half and rusty junk on the other
because half the gear was in sitting gear lube while the another half
was in water for decades. Many a gear case has been found broken
in the spring because somebody assumed there wasn’t any water in
it the previous fall.
Tubs.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.