Follow Manortom's recomendations-a dave brown composit rod, and drill it out and use 4/40 rod. Follow instdructions and will neaver break and will be stiff. Nothing betdter than two servos there, but there is a down side to two servos and thats tryhing to sinc. them in their travel. Matchboxes really dont help much if any. You have got to get your geometry correct at the elevator halfs. Drill your control horn locatins with the two matched together (tape) and drill for the control horns on a drill press that is 90%. A tiny bit off will make your plane a dog for harriers etc. If you go to two servos, make the servo locations IDENTICAL, the pushrods IDENTIAL, EVERYTHING IDENTICAL. If the two elevators are not alligned at servo nutural, YOU WERE NOT IDENTICAL. Most likely to be a dog until you get it right. The dog go to great when its correctly done. This is a hard learned lesson from Chip Hyde who almost beat this old man to death to get it right. Chip has got the be the most patient human on this earth! Wonderful guy in my book, we are fortunate to have a number of his tipe in our hobby!