I do not remember where I got this document from. Probably from a Russian camera forum or website. Anyway, it’s not of my making, so credit due to whom it made it public.
Especially handy if you wish to adjust the rangefinder on these cameras, which seem to be an issue with Russian overall quality control. Yes, they are little beasties, but one needs to be lucky to get a good working camera. I would know…I went through at least a dozain of them russkies and they do have a mind of their own.