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Old type barrel / main spring guages

AshF
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AshF WRT Addict

AshF

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So I get that the notches in the side are to measure the mainspring height, and that you can use the depressions in the centre to fit arbours.  But what are the numbers for the barrels?  It's obviously a sizing guide but what are the units?  I think I have a number 3!

image.thumb.png.5cfd9e9115f141dbe98e19b8d8eabbb2.png

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