I was given the trim tab indicator by the Bennett Co. when I did the Advertising pictures and TV spot for Ship Shape program. Put them into the boat approx 1 year ago they work great and I now rely on looking at the indicator as much as the angel of the boat. One of the things I like about them is that you might want to lesson the amount of the tab on the opposite side than adding angle on the side that might need a little more angle. With the indicator you know exactly where you are at.
FellowShip
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My motto: Just for the Grins