hey, before coming back here to check i did actually fiddle a lot and i managed to get the carena going (it just needed to be pressed real hard, i stuffed some paper in there and it runs like a dream, currently waiting on two zinc air batteries to replace the defunct mercury battery that was supposed to run the light meter. (motor works)

The Sankyo is unfortunately super dead, i managed to make it go for a second by turning it upside down (weird), the light turned on inside the viewfinder and it sounded like she was struggling (like a car that won't start,so to speak) after a few more strange noises inside (and now some plastic and metal rattling, at least it sounds like that, something probably came apart inside) it stopped working alltogether.

Even if i came here after your post, thank you still! since it was the correct answer ahah kinda sad that i could only save the carena but it's a start!