Very interesting Rob and neat work with that hairspring and regulator. I can appreciate how critical these adjustments are to getting the movement to run well in all positions and it's not as easy as you make it sound.
I've just completed a 1951ish cal 351 which also needed hairspring work (not as much as this though) and was very dirty with some other problems. Running well now but these 50s movements seem to be more abused than ones just a decade younger. Are you also seeing that or have I just been unlucky so far....
Out of interest, do you usually remove the balance and hairspring from the cock before cleaning or was it just this movement? I've been cleaning the plate with the balance/cock installed and Incablocs removed. Any adjustments being done afterwards. Just interested to see if there is another way of doing it.
Cheers, Chris
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