My 22 came the same way but the prop driver went on with a little reluctance. Very tight fit for the key. Put a prop on and tightened her down.
sn 12d69 22cc, This is going in a Balsa USA Phaeton 90 after I build it..
sn 12A62 38cc. This is on a Bridi Old Timer to replace the Syssa 30 which is now on a Giant SuperSportster.