Good day in the workshop as this parcel turned up from Switzerland. Inside the box is the balance hairspring adjusting tool I won in an auction. So hopefully I can get on with replacing the hairsprings in pocket watches! (Once I have cleaned the tool and practice on old movements).
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| E. Luthy Hirt Balance Hairspring Adjusting Tool |
E. LUTHY HIRT (BIENNE) BALANCE HAIRSPRING ADJUSTING TOOL SERIAL N° 5315 with Original Box
it does one thing, and one thing only, which is let you vibrate a balance spring. This tool is used to let a watchmaker determine the correct active length of a balance spring, once it's attached to a balance – in other words, make sure the active length of the balance spring is such that the balance is beating at exactly the correct frequency.
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| E. Luthy Hirt Balance Hairspring Adjusting Tool |
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