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The Encyclopedia of Horology

Glossary · Mechanism

Click spring

The small leaf spring that presses a click into engagement with its ratchet wheel.

Explanation

The click spring is the small leaf or wire spring that presses the click into the ratchet wheel's teeth. If it weakens or breaks, the click can lift and let the mainspring unwind suddenly through the winding work — a sharp bang that can damage the train. It is a tiny, easily lost part and a standard service check.

In the object catalogue

Catalogued objects whose own source record mentions “Click spring”. The quoted line shows where; it is the seller’s or museum’s wording, not independent verification.