RE: Your Comments on how to do this balsa glue job
Drill a small hole in the aluminum gear. Fill the hole with balsa. Then glue the balsa sheeting to the balsa you filled the hole with. That way, the balsa sheeting can't move, but you have no balsa-to-aluminum glue joint. Another way is just to make sure the large pieces extend a quarter inch or so beyond the aluminum gear on each side. Then put the balsa strips for the leading and trailing edges of the gear between the sheeting pieces and glue. The balsa is free to slide on the aluminum gear, but it has no place to go, because the fuselage and wheel pants will keep it in place.