Grease Mount Update
The grease mount performed very well. It showed stuff in 120 feet of saltwater that I've never seen before. Used SuperLube, which some one else had suggested. It appears to be about the consistency of the lube provided by Humminbird in their in-hull mounting kits. I tried eco-friendly lithium grease from West Marine, but ti was very thick and tended to get chunky.
I simply used foam to create a tight-fitting well for the transducer. Gooped it down. Coated the well bottom and transducer bottom and sides of transducer. Inserted transducer into the well, push down, jiggle. Press down with a plug of foam. I might glue velcro to the foam well to strap over and hold down the foam plug. Signal is as good as when I hang the transducer over the side of the yak.
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