R U sure you mean that? A right-handed nut would need to be on a pulley that turns anti-clockwise to tighten itself.Today's gripe.
The alternator spat it's pulley oft again..
How can a right handed nut that secures a pulley that runs clockwise undo itself?!
This is why peeps who have knock-ons have the nuts that tell you which side to put them on.
There was once a member of a kit car club who put them all on the wrong sides and a few miles down the road all his wheels fell off!
Luckily only his pride was hurt.