Hello again Doug..
Yes there is a small amount of flex in the cable, but it is minimized by removing the throttle detent in the transmitter and using a very light return spring. A little drop of (very light!) oil in the cable helped alot. This is with an O.S. 10 in a 2 meter glider with rud.,ele. and throt. with taildragger L.G. so high precision isn't required, although Nick has no problem finding the throttle position (1/4,1/2etc.) that he needs.
However, Nick is getting bored doing lazy loops, barrel rolls and spins. He wants to move up to a Kadet LT (or similar) with ailerons.
He's using the same Futaba trans. also. Can't wait to see the solution you come up with.

Dale