But how could I do that? Its top-hinged at 30-deg on each surface,

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So if that is the elevator half, with the hing on the left, and the rod down as such, it has to be away from the hingeline. I have offset swivel's that say "can be .5" off from hingeline", but to get the connection to be on the hingeline I'd have to put the rod in at an angle so that the tip of the rod would be under the hinge line, is this how you do it?

Thanks,
Sam