Since you have the front transom open, get an old trollin motor and leave the motor base on the shaft with the base plastic at the top of the shaft. Set your FF or screw it into the plastic at the top and tie your transducer to the troll motor base. This way you can remove it and its in front of you on the front transom high enough to see at all times. I have seen a ton of old trollers on old boats. Repair shops are good for it. If you offer them $20 for the old troller they will take it.