I recently picked up another "Luftwaffen-eigentum" Berning Robot II camera. They always find their way to me with spring-motor problems.
The first one was given to me, back in the day. It had a broken motor-spring and I had it overhauled by Robot-Kameradienst. (Shortly before they closed up shop) Then I had to buy a matching Luftwaffe-marked Tele-Xenar for it. The free camera became an expensive camera
The second one I traded for a military Kodak 35 "PH-324" camera. The ratchet pawl's tooth on top of the motor drive was worn down.
A few minutes with a dremel fixed that. It came with a luftwaffe-marked Tele-Xenar.
Both cameras work fine now
Now, freshly arrived number 3 is going to be a bit harder to fix. The ratchet wheel was missing and the leaf spring that pushes the pawl against the wheel has broken off.
So I spent an hour with a dremel making a ratchet wheel, literally a 1 euro cent part.
No idea how to fix the broken blade spring yet, though. I can probably punch out the remains of the old one, but I need to come up with a replacement or figure out an alternative....
....and find yet another "Luftwaffen-eigentum" lens for it.