11600-17 BP24 12R 2-86 Andersen Balance

A quick learner from north carolina says:
My balance has 11600-17 and BP24 12R 2-86

what replacements do you have?

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Tom from SWISCO responded:
Can you confirm your stamps? Make sure to discern how the numbers are printed; some numbers and letters may be smaller or larger, which is an important difference. I think the key stamp may be "BP24." I suspect that "B" might be an "8." Can you confirm? If possible, show us a picture of the stamps in question. That will let us know for sure.
A quick learner from north carolina says:
The numbers are definitely as I listed....
User submitted a photo of a window balance.
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Paul from SWISCO responded:
They sure are. I can see why Tom wanted to double check, as this one is new to me, too. I haven't been able to match this stamp up to any other Andersen balance. Can you give me the width x height of the visible glass for the sash this balance supports? We may be able to calculate the proper match based on that information.
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