Here's a site, with pictures, that shows you how to disassemble one of these things:

http://daniel.mitchell.name/cameras/canter/canter.html

I must say that I'm truly amazed. Not by the camera...but by the pages that one finds on the 'net. Who would have though a page would exist that shows how to disassemble this camera?!?

Good luck with the camera. It's an interesting little beast.

Be well.
Dave