What you're after is to have the trailing edge of the trim tab aligned with the trailing edge of the remainder of the elevator. I used a piece of alumninum angle taped to the trailing edge of the elevator and extending out to provide a reference for the trim tab. This established the dimension of the gap between the leading edge of the trim tab and the trailing edge of the elevator. Position the hinge in place such that the pin is midway between the edges of the trim tab and the elevator and that's it.
William
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