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post #3 of Old 04-23-2011
lancelot9898
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I'm debating the same thing. I have a 25 year old Impulse transducer and display that I'll probably replace with a dedicated Furuno instrument. The installation instructions for the Impulse transducer says to drill a 2 1/16 hole whereas most of the current airmar transducers say to use a 2 inch hole. Not sure if that is significant. Plus there is limited overhead access to the bronze thur hull and not sure how easy or difficult it will be to remove since the boat yard did the work years ago and I'm not really sure as to the caulking used. I'm thinking of putting a pipe wrench on it after the nut is removed and twisting it to break the seal.
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