Steve what does the mount look like? And is it a easy out to remove the engine?
And a pic of that rudder.

If you use a square drive, you need to loosen one screw , slide the stinger back till square end of your flex shaft comes out of the hole and you're good to go. Only thing is, don't forget to retighten that screw when you put everything back ot you could lose a very expensive prop, and flex shaft. I know. I have one sitting at the bottom of the lake.