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The Encyclopedia of Horology

Component record · Train

Third Wheel Pivot

Partially verified

Finely polished shaft end

What it does

Rotates within a jewel or bushing

How it works

Evolution

Burnished for low friction

Known variations

    Identification for collectors

      Common failure modes

      • Scoring

      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.