1/2" sash balance

A home owner from Tustin, CA says:
Hello, I need some help with a sash replacement. I am attaching a picture for your review. The window weighs 18lbs.
User submitted a photo of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
I'm afraid I cannot determine what you have based on this picture alone. 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.
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