Balance length question

Home Owner from USA
Have Home Depot American Craftman Windows from 2006. Need balance springs. Looks like your 351 series. Metal measures 28" but numbers stamped on side are 27 4. Do I need 27" or 28"?
2 Replies
Tom
Tom from SWISCO
SWISCO
Expert
Don't worry, that's normal. If you have a stamp that reads "27 4," then the metal channel should be 28" long. I know it's confusing but that's just how the industry makes them.
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