Aluminum spinners need to have an adapter nut. You will need a 5/16 x 24 "long" adapter nut most likely. Tower hobbies sells about any size tru-turn 3-blade props. You will most likely have to grind on it some to get your props to fit( I always do). For some reason all my aluminum spinner needs a spacer washer on top of the prop washer because the adapter only screws on so far,so watch for that.