Mainspring size, what do you think...

Share experiences and specs of different watch movements
djolemag
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Re: Mainspring size, what do you think...

Post by djolemag »

I've finally ordered gr4307, will update with results...
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Re: Mainspring size, what do you think...

Post by Yoda »

I hope that it is the right one.
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djolemag
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Re: Mainspring size, what do you think...

Post by djolemag »

Update:
GR 4307 is the same size as 43071 but it fits for ut 285 due to wider starting coil, where barrel arbor fits. It is too wide for 6497 arbor...
Hence, with some tweaking it can fit to smaller arbor but...

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