Hi!
I'm trying repair a vintage Fuji music box movement. At first it seemed overwound, and after using some oil it released, but then it started snapping back and unwinding immediately when I tried to wind it. As I was investigating, a small U-shaped wire fell out if the mainspring housing. From what I understood, it could be a tension spring that pushes against the pawls. I think it goes underneath the silver gear in the picture, but I cant find the exact placement. I'm attaching pictures of the fallen part, the music box, the mainspring housing and the gear with pawls underneath.
Does anyone have a diagram or a photo of a Fuji/Sankyo movement that shows exactly how this spring anchors, or any other information? I hope I got the terms right.