Window sash balance placement

A quick learner from Pennsylvania says:
I need to replace 25" sash balances that are stamped with 24B. I'm not sure what weight rating that would equate to. Could you please direct me to which balances I should order with that info? Thank you...
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Casey from SWISCO responded:

I'm afraid I cannot identify what you have based on this information alone. The stamp only indicates the spring strength calibration and is not otherwise used to identify your balance. I recommend that you look at our Channel Balance Home Page and follow the steps in order to find the Series that best matches what you have. If you can't find a match here, please show us a picture of the top nylon attachment and a picture of the bottom nylon attachment and we will do our best to find a replacement. Thank you.

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