RE: Sig 1/4 scale Cub build?
If it were me, I'd use the pull - pull cable solution as well. Makes for some difficult time getting the rigging right where both elevators track the same. But with patience it can be done. An alternative would be to drill through the dowel into the balsa, which joins the two elevator halves together with a 1/16" bit and go deep enough to allow a couple of tooth picks to be pushed through the dowel and into the balsa. This adds a great deal of strength in that joint when glued with thin CA.