Replacement Balance

A quick learner from Oakland says:
Hello, I am looking to replace a double hung window sash balance. The balance is 36" long with the spring about 20" long, however the string is attached to something like a balance shoe. I have not been able to find a balance with this attached, please recommend a possible match, thank you.
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Casey from SWISCO responded:

Hello, thanks for writing in. I'm afraid this is not something we can supply. I apologize for the inconvenience and am sorry we couldn't be of more assistance in this matter. 

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