I was using a little to narrow cog, so it got loose to the point where it met the lockring.
I didn't have a spacer at that time, which i have now. But the only way i could get it tight enough was with a whip..

I can strip the treads on a hub using a whip, you wont ever be able to do that using the cranks as a leaver.

Come on, there must be some science geek out there, that can do a little math on it, and tell everyone i'm right?