Y vintage hunter 30's knot log display has disintegrated. Sine the transducer also has problems the question becomes what to replace it with. I am less worried about replacing the display with a modern unit but I don't want to replace the transducer through hull. Is anyone aware of a modern unit that's transducer will fit the existing through hull. Yes I know I could replace the through hull but this is my last season aboard and pulling her to do that is not something I want to do.