Hey, after I painted and reinstalled my steering column the height adjustment became loose. I took it apart so I could've done something wrong, but I don't think so.
I already grinded down the paint where part 3 and 8 (in the picture) are touching the steering column. I tightened the nut (part 10) with 14, 18 (according to the manual) and even 30 Nm (with the the lock, part 9, in the locked and open position), but after I open and lock part 9 it becomes loose and doesn't lock the steering column anymore ( so I can slide it up and down in the locked position ). If I tighten the nut with more Nm, I can open and lock it several times before it comes loose.
Also I couldn't find part 3, but I think I never had that and installed a washer instead, also didn't help.

 

I checked on another Z and he has part 3, I'm trying to find or build it and see if that fixes it.

 

Looks like you need to tighten part 2 before 10?

 

In the manual it only says to tighten the nut with 14 to 18 Nm.
The nut is on the screw and touches nothing else so I think it won't make any difference, but I'll try it out

 

Ok, nvm. I get it. 10 will tighten 2 when tightened. Part 3 has to be the issue then