Nikkor 20mm f/3.5 AI disassembly guide

[whatdoido]

Nikkor 20mm f/3.5 AI - https://whatdoineed2do.blogspot.com/2025/11/nikkor-20mm-f35-ai-repair-service.html

Put off servicing this for years - the thing that threw me was the focus grip felt like it was solid, due to old age and glue, but once you get that off you're only to struggle with glued rear mount screws.  This is a rare one of the few Richard does't have on this site - this one seems so much simpler to do than the AI-S version that Richard covers.