My Stiks have all been GP's. I did stiffen the rods on one of the ARF variety by fishing a strip of lite ply back across the cutout in the center of one the rear bulkheads, under the pushrods. Then, I notched out another strip to accept each of the pushrods, guestimating the amount of separation (I was a little off, but not enough to matter enough to notice). Again I fished the ply back to the same bulkhead over the pushrods, trapping them against the first piece. To do the fishing, I drilled a small hole in the center of each strip of ply and screwed in a threaded wire pushrod making a long handle. I applied 5-minute epoxy to each end of the strip, fished it to the bulkhead and, when I got it positioned, pushed on my "handle" to set it in place. It took a little maneuvering to get the strips past the servo tray, but after a couple of dry (no epoxy) runs, I found the right path. The only real problem I encountered was having to sit there holding the strips in place until the epoxy set up enough to be able to unscrew the handle. Sounds more complicated than it actually is.