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The Encyclopedia of Horology

Component record · Keyless work

Stem Square

Partially verified

Square section of stem

What it does

Drives the clutch wheel

How it works

Evolution

Precision fit required

Known variations

    Identification for collectors

      Common failure modes

      • Rounding of corners

      Diagram

      crownsliding clutchsetting wheelswinding pinion and ratchet
      Schematic: keyless winding and hand setting. An outline schematic drawn to show the arrangement of the parts discussed here. It is not a dimensioned working drawing and does not depict a particular maker's calibre.

      Sources & references

      1. de Carle, D., Practical Watch Repairing
      2. de Carle, D., Watch and Clock Encyclopedia
      3. Daniels, G., Watchmaking

      Where sources disagree, the disagreement is stated rather than resolved silently.