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The Encyclopedia of Horology

Component record · Train

Column Wheel Screw

Partially verified

Left-hand thread screw

What it does

Secures the column wheel

How it works

Evolution

Often blue or polished

Known variations

    Identification for collectors

      Common failure modes

      • Broken head

      Diagram

      driving wheelcoupling clutchcolumn wheelpusher
      Schematic: chronograph control. 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.