[morzh]

Yes the three ball bearings should go in the holes.
The spring with teh cap should go first, then the balls (with some lube to hold them).
Then the fine adj shaft with the small ball.
Then the whole thing (both shafts, one inside the other) should go inside the larger cylinder, with the fine shaft inserted such that balls are not interfering with the whole thing going in.
The whole thing should be pushed in untill some sort of latching happens while it is being pushed in.
I am not sure what's inside.
The big cylinder should keep the balls inside so they do not let the fine shaft get out.

I never disassembled this, so I am kinda modelling it in my head, based on similar gears (which are not 100% the same).