anderson spring balances Looks like E19 9p 27 ?? windows may be 20 years old

A contractor from Georgetown DE says:
See photos - need 6 replacement springs
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Paul from SWISCO responded:
Based on your stamp of "9 p 27," we recommend our 24-939 Andersen sash balance.
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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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