here is a close-up of the servorudder

The webbing strap plus wire and bolts seems to be rigid enough. Once the design stablizes I'll make a proper waterproof one sealed with epoxy, of course.

And I modified everything around the control lines and the power lines, making it easier to adjust (without having to stand on the duckboard) and reducing friction. Also I switched the wind vane pole for an old paddle (which I found washed up on the beach one time and kept, knowing it would be useful eventually) It has a handy mechanism for locking at a particular angle (twist the black grip thing) and also provides a disengage mechanism: slide it shorter, removing tention on the servo!

Easy control line adjustments:

vane pole moved outboard (provides a straight lead for the control lines, reducing friction)

and moved power line pullies, so they are at better angles, less friction and clearing away from other things stored on the rails (LPG tank, outboard)