Swivel ball links not good for big bird control surfacesWHAAAAT!!!
Just about every 35-40% plane I have seen or built has the Rocket City set up posted by bdphil.It just doesn't get any better than that,servo arms tend to vary between Nelson or aluminum.I can promise there will be no slop,and super smooth precision in the linkage,any slop will be in the gear train.I also use this sety up on 25% planes,a little overkill,maybe,but dependable absolutly.
Mike