Window sash balance

A home owner says:
November 16, 2020

Hello, the rope broke on both sides of the bottom window in a double hung window. After looking into it, it looks like I need to replace the two window sash balances. How do I know the correct part? 

After looking at it closely, it looks like the number 11600-17 is printed on both the left and right balances. But it's not easy to read.

Thanks.

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Tom from SWISCO responded:
November 19, 2020

We can definitely help with these balances, but that stamp you gave us isn't used to identify a match. There should be other stamps printed on the box that will be more relevant. If possible, please take a clear picture of every marking you see. That should help us narrow down the list of possible replcaements.
A home owner says:
November 20, 2020
Thanks. I took the entire window out to look closer. There is another number printed on the balance. It looks like 131 5423 9-86.

Do those numbers make any sense to you? They sure don't make them easy to read. You can try zooming in on the attached pic.

Thanks again for your help.
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Tom from SWISCO responded:
November 20, 2020

Thanks! That's the one I needed. The code right there reads "5#23," which tells me you can use our 24-531 Andersen sash balance as a replacement.
Andersen Sash Balance, 519, 523, 525, 527, 531
Andersen Sash Balance, 519, 523, 525, 527, 531
24-531
$54.20
How to replace an Andersen Window Balance
How to replace an Andersen Window Balance
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Andersen's Narroline Sash Balances
Andersen's Narroline Sash Balances
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