Window balance

Contractor from California
Hello I need this replacement balance. I ordered series 385 2740s but seemed too strong. What are your recommendations. Thank you
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Tom
Tom from SWISCO
SWISCO
Expert

A 2740 stamp should have replaced your old 27-4 balance without issue. Can you tell me the exact weight of the sash? That would allow me to determine the proper calibration. I'd also like to verify that you have the Series 385, just in case that might be the issue. Seeing a clear shot of the top and bottom fittings would allow me to do that.

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