The spinning bar of massacre was Creusabro 8000, and should have been the equivalent of hardox 500. Unfortunatly, the ones selling it to me didn't know what we do with it. Now they do.
It's perfectly possible that the Creusabro in real world wear resistance applications will perferm like advertised.

And perfect bearings. Every spinner I have build uses sinterbronze bushings. Seems to do the job.
Advantage. Smaller, lighter and cheaper than the equivalent in bearings.
Disadvantage, it gets messy with the extra grease after each fight.
But for every bearing/bushing, installation by the book, or else you get rubbish.