I have an Iskra (not the one with the MFN, another one) which looks very fine and works good after I have removed oil from the shutter blades. But it has another problem. There are those two strong springs that put and hold the bellows in place when the lens comes out. One of this springs is going out of position, so the right side of the bellows/lens will not be full stabilized. How can I put the spring in place? It is very strong, takein a little screwdriver and trying to put its end over the hook doesn't work. Has anybody an idea what I have to disassemble to get more space for working? Is there an easy way to remove the lens/shutter in one piece? There are 4 screws when I look from behind into the bellows. Do they hold the lens/shutter?