Transducers go bad, I know, mine took a dump. I had the same question you did when I first got it and ended up "gooping" it inside the hull. Removing the glued in transducer is a real pain to deal with and have zero intention of doing that again.
I have had the transducer glued/gooped in, held in place by glued in foam that was filled with electrical grease, and currently using the glued in foam method and filling it with 1/2 cup of water before each use (this is what I recommend as I get excellent readings and I can easily remove it).
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