The reason I'm asking this is because I did throw the propeller during break-in already, even though I was pretty sure I had tightened it sufficiently. The way it was set up was just the washer and spinner nut at the time. I've since installed the O.S.-provided locking nut pair that came with the engine, but want to get back to the spinner nut (just safely, this time).
Based on some advice I got from someone today, I've ordered:
Harry Higley's Light Lock Nut to pair up with a tru-turn spinner nut. I'm hoping the combination of the two of these will provide a secure setup.