Skip to content
The Encyclopedia of Horology

Component record · Power

Arbor Hook

Partially verified

Small projection

What it does

Secures the inner end of the mainspring

How it works

Evolution

Integrated into the arbor

Known variations

    Identification for collectors

      Common failure modes

      • Shearing off

      Diagram

      coiled mainspring inside the barrelbarrel teeth driving the trainarbor and hook
      Schematic: mainspring and barrel. 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.