Balance springs

A landlord from Hillsboro, Missouri says:
I have 2 broken springs, no markings found on any of the hardware. How can I decide on force selection? Can I weigh the window and split it for each balance?

Thanks,
John
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Casey from SWISCO responded:

If you are referring to individual springs from a  coil balance  system, then that is exactly what you would do, but these are the only balances that work this way. 

For spiral or channel balances , you would weigh the sash and choose a spring strength option from the chart under the product description. The balance on both sides of the window will need to support the full weight of the sash, so you would not divide the weight of the sash.

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