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While I still have full confidence in the web mount system that was introduced at the start of this thread, I will be testing a new, (for me), option very soon.
Hummingbird has a "just for kayaks" mount kit that includes a small plastic frame that is shaped like their transducer. This gets mounted to the hull with adhesive provided in the kit. They also provide a "special" grease that you put in this reservoir and then set the transducer in the grease.
It looks like a good system but I am concerned about the grease liquefying like the Vaseline does. I asked Humminbird about this and was told that it was a high temperature grease that will not liquefy. They are sending me a kit to test. I actually have one of these kits now that Dtownfan sent to me but do not have the grease so I have not been able to do the test.
When I have tried this system out, I will post the results.
I did a little research online and learned that there are many industrial greases, usually lithium-based that are very stable at high temperatures. My guess is that the "special" grease offered by Humminbird is one of those.
If you have a grease mount that works except that your grease melts, you might want to try one of these high temp products. If it works, going the DIY way will be much cheaper than buying the H-bird system which costs somewhere around $25. That said, if you get everything is a kit that is designed to fit the transducer, it may be worth the investment.
Stay tuned.
Bob
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