I bought this log and didn't drill through the fuselage as described, but rather mounted a holder on the stern (I made this from stainless steel) and mounted the transducer on it. Then I put a cylindrical vessel (0.5 l coke bottle) over the entire transducer with cable and filled it with cable resin. So I made this transducer absolutely waterproof. I tested the log for 2 weeks during the Whitsun holidays in Spain and am absolutely thrilled. In short a top device!