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The Encyclopedia of Horology

Component record · Train

Fourth Wheel Pivot

Partially verified

Extended shaft end

What it does

Supports the second hand in some designs

How it works

Evolution

Often extended through the dial

Known variations

    Identification for collectors

      Common failure modes

      • Bending

      Diagram

      cap jewel (endstone)bridgeplatepivot running in a hole jewel
      Schematic: jewelled bearing at a pivot. 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.