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After much trial and error i can now change gears from the cockpit , its not 100% but it dose work, i used a couple of old uni joints out of a 1/2 inch drive socket set, and they work fine but unfortunately have a little to much side movement in them, so will have to try and source some small steering uni;s from somewhere.
but at least the concept works
i might wind up upgrading the control tube to 5/8 or even 3/4 just to give it some more strength and a more positive feel
cheers John