This is description of this part:
A complete focusing block for coarse (macro feed) and fine (micro feed) movement, complete with knobs.
Leitz produced several versions of the SM model. This block is from the model with black plastic knobs. In contrast, the SM-D version has metal knobs (link).
What is this part needed for?
- as a service part when repairing the focusing mechanism (vertical movement)
- if you want to quickly replace the entire block
