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You could just glass in the hole and mount transducer in the inside if hull is solid fiberglass. I did this when I had problems with my built in one, I bought a cheap one and mounted the transducer with 4200 and temporarily mounted the instrument while my old one was sent to the factory to be repaired. You can test it this will work by filling a plastic bag with water (absolutely no air) and rest the transducer on the bag.
The key is there can be no air pockets, so if hull is not solid fiberglass it won’t work, that’s why the plastic bag test can’t have any air whatsoever, best to fill it by submerging the bag.
 
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