I just had one of these apart as I'm going to convert one into a pinhole camera. It should make a good pinholer, as it's got nearly a 4" focal length, and I want my PH camera to be a little more telephoto than usual.
It looks like there's 4 springs in there. One for the shutter release button, one that slings the shutter plate around, one the holds the catch, and I think one that has something to do with the bulb setting. Which one are you looking for?