Cruising Sailors Forum Archive
I see the problem...
In Response To: Here's a pic of the forward mount (on which there is room to have two nuts both top and bottom) 
()
() Your engine is mounted sideways. 
If you don't like the idea of traditional loctite you could try Vibra-Tite VC-3. You coat the threads and let it dry before you assemble the nut. You can adjust the nut after assembly and it still maintains the thread locking. The challenge might be getting the threads clean enough to get a good bond.
