Part ID help needed

A home owner from Seattle, WA says:
December 16, 2021
Hi there.

Need some assistance in referencing the correct replacement window balance. I have a Caldwell block and tackle balance, 1/2" wide channel, 13" length, 12-5, 1" deep foot, wings on both top and bottom fittings. I'm not certain which item in your catalog best fits this.

Thanks!

Steve
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Emily from SWISCO responded:
December 17, 2021

Hi, Steve.

With this combination of fittings and a 1" deep shoe, you'll need our S380-13. Your stamp doesn't match any of our standard options, however. Can you weigh your sash on a scale and tell us the weight? That will help us determine the appropriate spring strength for your balances.

Thank you!
13" Series 380 Channel Balance
13" Series 380 Channel Balance
S380-13
$9.34
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