I don’t, sorry! I used an exploration method to fix this lens carefully without forcing anything open.

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Dmitri Mar 19, ‘23

Do you have a favorite guide for servicing these? I’ve got a pre-war(!) copy with a stiff aperture that I’d like to re-lubricate but I hesitate to take it apart without some sort of service manual…

I don’t, sorry! I used an exploration method to fix this lens carefully without forcing anything open.