I would say you probably have had them but the keyed collet version where the collet can stay in the hub when you have pressed the crank out . If you didn't look closely into the hub you wouldn't notice it was in there
I would have seen it when I cleaned up the parts for reassembly. I always polished the prop drive hub before reinstall ..... except the anodized ones of course. I still cleaned them thoroughly. Oh well, no matter. I've learned something new about these engines. Like so many other things, no knowledge that will ever make me a dime but still good to know.