window balance number stamp

A professional from Kalamazoo, MI says:
November 4, 2020
I have a window balance that has a "28HB" stamp on it. Can't find anywhere a HB code. any help on getting the correct one would be appreciated.
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Casey from SWISCO responded:
November 6, 2020

Hello,

We'd be happy to help but we would need to see an undamaged balance removed from the window to identify a potential replacement. The stamp only indicates the spring strength the balance needs to hold the window sash, so we need to identify the balance before we deal with the spring strength. Thank you!
29" Series 751 Channel Balance
29" Series 751 Channel Balance
S751-29
$11.73
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