Yours is from an earlier motor.
A 22 would look like tiller pictured here.
http://aomci.org/forum/viewtopic.php?f=3&t=10728
There should just be a straight pin going through there
not a bolt. Your bolt would have be loose so it can move.
If that doesn’t work it could be welded so it can’t move.
Have you had it apart?
These are all the parts for yours except for these two screws. (Red Arrow)
A 1922 gear case should look like this.
If yours looks like the 1920 one yours is earlier.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.