The easiest way by far Tonski is with a great big blob of silicone. Lightly sand the target area, wipe down with metho, form your blob, making sure to leave the tip of the silicone tube in the blob so as not to draw air into it and then wipe your transducer with metho and stick her in. Make sure to push it all the way to the bottom of the blob and hold in place with some weight. Give a few days to dry. Gently heating the inside of the kayak with a hair dryer or such will aid the drying process. Steve.