Well it seems as though I'm going to put the boat on the hard in order to repaint the bottom and while I'm at it, I wanted to replace the speed log transducer that is in the thru hull in he forward cabin. I believe that the old transducer is about 1 1/2 inches in diameter. I want to replace it with the Raymarine P319 transducer which is compatible with my e7d. However this transducer is 2" in diameter. Can I simply enlarge the existing thru hull? Has anyone replace the older transducers with newer larger ones up front? Thanks... Jon