Cool idea!
My question is - why not just put the float on the transducer cable - like a Vex. I just did that - hopefully that is okay.
I am guessing that Lowrance can't suggest you do this due to patent issues???
I used the rubber cord thru the ducer holes and taped the rubber to the transducer cord so that the weight of the ducer would not pull too hard inside the ducer.
Landry