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Here is a picture of an adjustable jackplate I built for my 13` Whaler. Haven't had a chance to test it yet, with the new Merc, but it improved the performance of the previous motor a `58 Evinrude Lark 35. It was easy to make, Just a piece of 8" aluminum channel and aluminum angles. A block of mahogany was bolted on the channel, becuase the motor was equipped with screw clamps. If I was building one for a 17 footer I would use a piece of 12" channel instead of 8"
rich

http://i27.photobucket.com/albums/c19...rMerc1.jpg