double hung balance spring

A handy person from bluffton SC says:
double hung balance spring replacement
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Casey from SWISCO responded:

Hello, thank you for posting! We would be happy to help you find some replacement balances. However, we carry quite a variety of balance styles and sizes, and therefore would need to see some pictures of your hardware in order to make a recommendation. Take a look at the associated videos to get an idea of our different identification processes. 

A handy person from bluffton SC says:
The length of metal sleeve is 35 inches
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A handy person from bluffton SC says:
These photos are in addition to the ones previously sent
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Casey from SWISCO responded:

Thanks for these follow up pictures! They are exactly what I needed to see. It looks like you will need our S770-35 , with the 35C stamp option. Good luck with your repair!

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