I always replace the wood type pushrods with the Sullivan Gold-N-Rods on .40-.50 sized models. There pretty cheap at around $5 and you get two 36" flexable pushrod sets which will do your rudder and elivator and a little left over for the throttle. You can get a piece of thin plywood while your getting the pushrods to make a servo tray, I still have mine from my old TT 40 trainer in the scrap heap. Cut out your servo openings Two length wise (side by side) facing the back of the plane, one for the rudder and the other for the elivator and one sideways to the front of the plane for the throttle servo. Be sure to glue the red housing for the pushrods close to where the servos are and where it exits from the back of the plane I used a square piece of plywood and drilled two holes in it then ran the two rod housings through it and glued them. That way the push rod running through it won't cause your controll serfaces to have play. You can also run one for the throttle but on most planes I just use a thick wire from the servo to the throttle.