Also be aware of warranty issues. I recently installed a whole bank of new Raymarine and every transducer had dire warnings regarding the fate of my warranty if the cables are in any way stretched due to pulling them thru.
I would go with the thinnest strongest cord you can find (if ever I had a logical application for Dyneema, this would be it) because if the joint between the old cable and the new one parts halfway down the tube, the nightmare really begins.
SD, if a messenger doesn't already exist, the old transducer line is your only choice. And why would you want to save it if the transducer is being replaced? BTW check your first post and then your last?? I don't get it.
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