Hi guys this is my first bass guitar kit (JB-4M)

I am just trying to install the tuning pegs and i had a question. The metal sleeves that go into the holes in the headstock seem a little lose and i can’t understand how the sleeves don’t fall out of the holes when the tuning pegs are screwed in. The metal sleeves don’t seem to screw in anywhere.

I’m not sure if I’m missing something or being an idiot.