two pair of window balances

A home owner from Angels Camp CA 95222 says:
first pair marking: 31 9 38# LN CALDWELL

second pair marking: 29 3 CS CALDWELL

several other windows are very hard to open and close. should replacement balance springs fix the problem?
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Yes, new balances should fix your issues. I'm just not sure what you have, exactly. Your stamps only tell us how strong the spring is. 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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