I just bought a Furuno 620 color, nice small unit with lots of features, about $600 I also have a thur hul ducer I had to drill a 2 1/4 hole for bnut not a V20.
And you are right the V is not cored, But my Sea Ox is.
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1986 V20 
Old Fishermen never die, we just SMELL that way!!
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