Sounds like the stabilizer rod needs to be adjusted. If this rod is just a little long it will not let the motor down far enough for the motor to lock in place. I had to cut the rod twice before I got it right. The rod has a threaded end and a smooth cut end, hack saw or cut off saw will get it done. Shorten this rod till it is the right length for the motor to lock. Mine is just off the deck of the boat, it will allow the shaft and motor to move but not much. That is the only problem that I had installing mine.