Replacement constant force balance

A handy person from Cincinnati Ohio says:
July 10, 2017
I have a Double hung window and the coil broke in half in the Balance.I would like do get 2 new ones so i weighed the window which weighs 14 pounds so what Replacement constant force balance do i need the one that came out is only a single coil with no markings THANK you.
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Tom from SWISCO responded:
July 13, 2017
There are many possibilities. I note you were looking at our Series 140 coil balance. Is this a match for what you have now? If so, I'd recommend our S140-7. Two of these will carry 13 through 14.99 pounds.
10 lb Series 140 Quick-Tilt, Single
10 lb Series 140 Quick-Tilt, Single
S140-10
$9.85
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