Mainsprings – should they be replaced every time a clock is serviced?

A short while ago I received a letter from one of my readers. The writer asked if I knew the size of a Junghans B11 mantel clock spring. That was it. No mention that the spring was weak or broken, just one sentence with no explanation. My reply: “I do not have the mainspring size”. … More Mainsprings – should they be replaced every time a clock is serviced?

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