You don't need nyrod. Make some suitable hinges from G-10 material or PC board. Align them and connect with piano wire, each side being the same. For the elevator control yoke use Heavier piano wire and a brazed horn. A pocket fabricated in in each elevator half will accept the ends of the horn. At the outside of the elevator, bend the piano were in an "L" This can fit into a small slot on the outer end of the elevator. A small bit of clay will keep it in place. Paint the clay etc. You can remove the wire then any time you wish or need to..