Bergeon Clock Mainspring Let Down Tool

Key to let down and wind up clock mainsprings.

  • 1 chuck holder fitted with a rubber handle
  • 24 numbered chucks with winding squares from No 000 to 21 (Ø1.75 to Ø7.50 mm)
  • Steps of 0.25 mm
  • 1 special winding chuck for alarm clocks
  • 1 removable metal handle
  • In wooden case
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