ETA 2472 - how to tackle this crown and stem?

[Michalzeszen]

Hi there!

I have been servicing an old Technos Star Chief from the 70s, and so far so good, except for the crown and stem.

This is only my 4th or 5th watch service after a year of fiddling with cheap movements, and I'm having a hard time understanding this seting mechanism.

 

1. What is is called?

2. How do I assemble it?

3. Can we confirm all is there?

ps.: bonus pics demonstrating how it was bought and how it is going.

 

[Klassiker]

It's a so-called split stem. I'm guessing the spring is for the screw-down crown operation. I don't think I've ever seen both features together before, but it looks complete. If I'm right, the crown will have an inner thread and the tube a matching external thread. Replace the seals if you want it to be watertight.

If you can compress the spring far enough, slide the two parts of the stem together sideways. If that doesn't work, you should be able to push them back together end to end, the opposite of how you pulled them apart. 

[Nucejoe]

2 hours ago, Klassiker said:

 slide the two parts of the stem together sideways.