I am working on a UG Cal 85 space compax. The crown and tube are intact. The stem is missing. It has a locking crown but the crown only has a female thread. Does anyone know what the schematic is for the Cal 85? It is a Valjoux 72, but it must have some kind of spring loaded stem. Any help is appreciated.

I am also looking for some parts. 20mm UG bracelet ends for Gay Freres original band.

Please advise
John

 

Welcome. We appreciate it if you introduce yourself. We also like pics. On the parts you look for:
https://omegaforums.net/threads/exemptions-no-longer.85118/

 

Yes, this system is spring-loaded with fine internal threads. It is a weak point on these models (along with rubber pushers) and Polerouter Subs Gen 2 and 3. I own several of each of these models and have had to repair one. It is not for amateurs or the faint of heart.