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Before anything else, how freely does the balance oscillate without the pallet fork in place? A light puff of air should set it oscillating for 60 seconds.
And without the balance or pallet fork installed, does the train spin very freely without abruptly stopping? Ideally the escape wheel should spin and briefly recoil to reverse direction when some wind is applied.
The plot thickens...
Good news is that power does move down the train freely, and the other wheels and pivots all look good.
Again, not sure how this is likely to have happened, theories welcomed!
Do you think the hairspring is salvageable? I was assuming I'd need to replace.
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