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S190-940 940 S190 Coil Balance Spring

I have a sash that when the glass gets replaced will be about 35 lbs. The existing coil balances are a pair of 7 lb coils on each side for a total of 28 lbs. How do I get to 35 lbs if your coils are only up to 8 lbs each? (I am referring to your S190 series)

I need the right part to order for my mi window...the coil spring that holds the window open broke. I took the window off and the broken spring has 932 stamped on it.