Well, I left my manual at my ranch about 300 miles away and now I need to replace the impellor. Can anyone out there tell me how to disengage the shift linkage so I can drop the unit? I removed a Phillips head screw with a "pin" end from the starboard side of the lower unit but it still won't drop. In the spring, I rebuilt the carb but this is the first time I have needed to work on the lower unit. What's the trick?