Here's mine. self-centering, too. 3/4" outside the vertical chine on each side allows for 1.5 inches of play.
BTW, This is how to mount a side-scan 'ducer and maintain side scan imaging at 30 kts.
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Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury
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