Channel Balance

A home owner from Tampa, FL says:
My channel balance has the numbers 38 and 2990 stamped on it which I don't see on your list. It is 1/2" x 30". The window measures 50" wide and 30 1/2" tall. What balances should I order?
User submitted photos of a window balance.
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Tom from SWISCO responded:
Thanks for posting! Before I can offer an applicable replacement for this channel balance, I just need to know a bit more information about the bottom attachment. Please take a look at our 15-004 and 15-005 channel balance shoes, and note their depths. As you can see, they are 1-3/32" deep and 1" deep, respectively. Which one more closely matches your own bottom attachment?

Can you also weigh your window sash? A stamp of 2990 does not match any of our corresponding options and we will need to know the sash weight in order to recommend one.
A handy person from Tampa, FL says:
My bottom attachment is 1" and the weight of the window is 30.5 lbs.
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Tom from SWISCO responded:
Great! In that case, take a look at our S380-30 channel balance with a 3950 option and let me know what you think.
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