I bought a Mosva-5 a week ago, and have broken it already!
Upon opening the folder, the leaver to activate the shutter had opened up on the wrong side of the shutter. I partially closed the folder so the leaver cleared the shutter arm and placed (gently) in the correct position. The camera now seems to be uncoupled from the plunger in the main body.
There are lots of repair docs on the shutter and lens, but not much on this.