Looking for tilt window 20 4 Balance replacement

A home owner from San Diego says:
I have a non-tilt window which has the balance which has 20 4 stamped on it. When I lift the window right side balance does not stay and keeps moving up with the window. I think the balance needs to be changed. Do you have this?

Please respond at your earliest convenience

Thank you,
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Tom from SWISCO responded:
Thanks for posting. Sounds like you have a 21" block & tackle balance with a stamp option of 2040. I'm afraid that's all I can tell based on your information, though. Now you just need to pick out the top and bottom fittings in order to determine the Series.

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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