Now, first off, the reason that I posted this in the balsa section was because getting into balsa has revealed a ton of new linkage options for RC. One of my favorites is the Sullivan Gold n' Rod and Gold n' Cable, which are both really percise and adaptable. They work better with standard servos however, but they can still be used on 9 grams with some work. The other alternative's I've sewn are the push rods slightly thicker than what are used in FT planes which are then put through a tube to reduce flexing, but this has to stay in a relatively straight line compared to gold n' cable which works great for going around a corner. If you want to be a little cheaper and use less complexity, there ia always the thickened up wire, but eventually the wire will be too large for the servo arm. If you are willing to modify your design you can sometimes use a pull pull method which uses two thinner wires or even cables attatched to the opposite sides of the servo arm, and attatched to a two sided control horn, but these can be finneky and complicated. Lastly, you can always zip tie on a barbeque skewer as well. Do you have any tricks and substitutes for the pushrods typically used?