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I was just curious. I've heard that is a problem with BW. I just got me an older (1986) 18' Outrage and got little wetness by the bottom of the transom where previous owner had transducer mounted. I removed the screws and stuck piece of wire in those holes. It came out little damp - but no water gushing out. I put a fan against it and will let it dry for couple days before filling the holes.
Watch this YouTube video!!!!

https://www.youtube.com/watch?v=bYizHBT5S5Q