Hey Jean
same question . . . did you ever get hold of a service Nizo manual?
Im a keen Super 8-er based in Cambridge, UK . . . with two snafued Nizo 561.
I'd really like to open them up and see if I can fix them and a service manual would really help.
If anyone reading this has one, please get in touch.
If I do open the cameras up, I'll be sure to photo-blog the whole process online.
Thanks
Si