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I have an old Retina Reflex IV on my bench going through a full CLA and it's my most challenging repair yet.
I resolved the original issue which was dry grease and I did a full disassembly, clean and lube with lithium grease, graphite and molybdenum grease, and I got it 90% of the way back together. I have to re-install some springs, get the shutter plate to line up with the cam and advance mechanism, and properly align the shutter speed and aperture plates which is proving to be difficult but doable.
