Following the instructions in the manual for removing the lower unit, I've run into a small problem. I have removed the bolts and nut securing the foot, and have removed the lower shift rod connecting screw. The lower unit now moves somewhat, but appears to be stuck! I'm guessing the bolt that the nut was removed from maybe has some corrosion on it. I've put some elbow grease on it but it won't drop. Any suggestions?? Thanks!