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Need this part has 3 stamp on it and is 1/2" wide

A professional from NC. says:
Need this part has 3 stamp on it and is 1/2" wide
just the Coiled Balance Spring
User submitted photos of a window balance.
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Tom from SWISCO responded:
Thanks for posting. This appears to be something like our Series 190 coil spring, but I'm not sure about that "3." Can you confirm that's what it reads? Are you sure it's not an "8" instead? If it is a "3" or if you're not sure, please tell me the weight of the sash.
A professional from Had someone with better eyes look at it and they believe it's an A says:
Tom
Had someone with better eyes look at it and they believe it's a 8
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Tom from SWISCO responded:
Great, I thought so. In that case, I think our S190-840 is worth considering.
A professional from NC. says:
Thanks
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