Bottom window sash doesn't stay up

Home Owner from Austin, TX
Balance spring broken. Don't know the weight nor the coupling color.
3 user uploaded images
2 Replies
Tom
Tom from SWISCO
SWISCO
Expert

Thanks for reaching out to us! This balance looks like it could be either our 3/8" diameter Series 400 or our 9/16" diameter Series 500. Unfortunately, the only way to determine the proper spring calibration is to weigh your sash. There's no way around that.

In the meantime, review the two products mentioned and see what you think.

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