Need to know if anyone has had good luck with through hull transducer, 5-6 years ago I installed one on my 99 201, I just smoothed the surface and epoxied, the picture on my X15 was very cloudy, so i went to the transom mount, I am installing a 113HD, Would like to go with the through hull if i can get pos feedback, I have herd that you can drill down up to 3/8, But only want to do that if i know that works on a cobra,THANKS