A common problem with Retina Reflex cameras is stiff control rings for the shutter speed and aperture settings. Here is a potential fix for you.
Consumables used servicing camera bodies:
I use naphtha (cigarette lighter fluid) for cleaning metal parts. CRC Heavy Duty Lectra Clean for dried grease that the naphtha won’t dissolve. A generic wax and grease remover to soak mechanical parts prior to cleaning in an ultrasonic cleaner. Glass cleaned with normal domestic glass cleaner.
Parts are lubricated with Inox MX6 (a synthetic grease), Rocol Dry Molybdenum paste, MicroLubrol Helimax XP helicoid grease, graphite powder, or graphite grease as needed.
Leatherettes are glued back with Ados F2 adhesive.

Consumables used servicing shutter and lens assemblies:
Naphtha (cigarette lighter fluid), or occasionally CRC Heavy Duty Lectraclean. Lenses cleaned with normal domestic glass cleaner.
Parts are lubricated Rocol Dry Molybdenum paste, MicroLubrol Helimax XP helicoid grease, graphite powder, or graphite grease as needed.

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