Clutch sleeve hub nut size?

[first vr4]

Can someone tell me what is the size of the clutch sleeve hub nut? Also how do you "unlock" it like the manual says?
Thanks,
Shawn

 

[RILEYDSKING]

i used a 32mm i think.impact gun unlocked it

 

[first vr4]

Yep, that's what I used. 32mm with impact gun