[HUG ] CDS metered Prism

Does know anything about these monsters. I have two, and they seem to be different. With one of them, the regulation of filmspeed and max aperture seem to be mechanical. There is sort of gear-drive that rotates the neter with needle and all, when altering film speed. The other seem to to same by a variable resistor. I would like to try to adjust the first one. It rads to low a low EV and to high at high EV, and is correct somewhere in the middle. Does anybody know how to go about this, or does anybody know where to find relevant information ?? 

John Dancke
Norway 

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