von Hoegh, I think that the lubricants must have been VERY spartan with these cameras. If they dried out, one would see residue. I have even opened one's that had gotten little use, flushed them out with lighter fluid, and did NOT replace any lubricants. After years, still fine. Perhaps on the pin that spins the gear or roller for the curtain. Honestly, lubricant is sparse but, according to your manuals, 'there', (albeit in tiny quantities). - David Lyga