Recent (large) ball-joint balls have 6 holes in them, while old ones don't have any, anyone knows why?
Friction seems very random with those joints (& it matters - you want more fiction for legs & less for arms, for ex), and I thought it may have to do with the holes, but not really.
I can imagine those balls being used for snapping, but I'm not aware of any ball-joint part with matching bumps for rachetting, anyone knows?