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The RC model airplane people have some flexible push rods that consist of an
thin, flexible, outer cover, that can be glued in place, and flexible inner
rod that slides inside. They also have  a number of fittings that screw into
the ends of these push rods and attach to servos or control surfaces. The
easiest to use is a ball and socket that snaps together.
If one of the balls (looks like a tiny trailer hitch ball) were screwed to
the acuator arm on the flap weldment and run up to the panel through the
consol to the panel you would have a rod that could be calibrated for
various degrees of flaps. You could use one of their belcranks and make a
dial type indicator if you prefered. 1/8" nilaflow run inside 3/16" nylaflow
will give about the same result as their flexible push rods, but you don't
get the color contrast.
Bill N7WB

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