I'm trying to pull the lower unit on my 1994 yamaha 9.9 4-stroke, and it doesn't seem to want to come off. I've looked all over for a hidden bolt (like under the zinc or trim tab) but there doesn't seem to be one. I've pulled the obvious four nuts off and disconnected the shifting rod...is there anything else that anyone knows of...or am I just going to have to keep tapping and prying?