Durwood, I don't know how "pretty" your install needs to be but here is a solution I used.
Buy a cheap 99c tupperware flexible clear container, the kind that moves easily in your hands. (I use one about 4" by 8") You can very easily cut out the bottom and shape the walls of the "no bottom container" with a pair of household scissors to match the contour of your hull.
Buy some 5200 slow cure adhesive at BPS or some marine store. Goop did not work as well in my opinion.
Rough sand the area of application with coarse grit paper. Wipe it down with some alcohol.
Trace the outline of the container and squirt a nice bead. Lay another bead around it , inside it, next to it, SQUIRT away! The 5200 is white and very flexible, does not peel or pull away from the hull.
Now mickey mouse a couple of plastic ties to hold the transducer in the container.
I think that many of the problems people have is because of the RIGID container or pipe which does not flex or give with the movement of the boad hull.
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