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Hello,

I am about 5 months into watchmaking and I love it!   The attention to precise detail is what really attracts me to it. (and the tools!)

I am working on a 16 jewel 43mm pocket watch movement.   There are no markings besides a serial number (122248) .  The balance staff needs replacement.

The roller side pivot broke off. 

I successfully removed the hairspring using Bergeon 5430's.  I successfully removed the roller using Bergeon 2810.   Did i mention I love the tools?!

I removed the staff from the balance wheel using a vintage K&D staff removal tool  with my Bergeon 15285 (that's the one that comes with a micrometer adjustment so it can be used as a jewel press as well as a traditional staking tool...it's sooooo cool...sorry..  can you tell i love the tools?)

No more digressing..  I measured the damaged staff in all the relevant areas but I have to estimate on some because one of the pivots is missing.

A = Full length  A= 4.80mm  (that's without the one pivot...if you assume that the missing pivot is the same length as the other pivot (I'm sure it's not)  then A = 5.12 mm...(can I assume 5.00mm here?)

F=  Hair spring collet seat  F=  .89mm   (safe to assume .90 here? .. I am sure that my measurement's would at least contain  .01 mm error ?)

G = balance wheel seat  G = 1.23 mm  (1.20mm?)

H  =  roller staff  H =  .59mm  (.60 mm?)

B  = bottom of the wheel to roller pivot   B  = 2.97mm  (3.00 mm?)     here I am estimating  again because this pivot is missing.

So my friends, and I thank you profusely,  can you point me in the right direction as to how to proceed?

Do i buy individual staffs?  or an assortment?   Since I don't know exactly the name of the manufacturer, will that be a fatal hindrance?   Tbh, I'm not even sure what country of origin this movement is.

Thank you!

 

 

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