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The Encyclopedia of Horology

Component record · Power

Barrel Hook

Partially verified

Internal catch

What it does

Secures the outer end of the mainspring

How it works

Evolution

Milled or riveted

Known variations

    Identification for collectors

      Common failure modes

      • Breaking 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.