Well the fishing line through the tube didn't work well at all,, too much friction , so I drilled through the wing and went straight from the servo horns to the water rudder horns, these seems to work just fine.

Basically I just tied a knot and ran the line through the water rudder control horns, the line runs straight as possible to the horns, where I have it going through the outside hole in the servo horns, then it wraps around the servo horn screw and that screw secures the adjustment. Simple but seems to hold and work well

I'm hitting the water/park later today,,, Maybe Hitting is a bad choice of words