balance spring

A landlord from Norfolk VA says:
These are window World windows and some of the balance springs are very hard to lift. I was told that they cannot be adjusted like the spiral balances. Do you have a replacement and how do I find out my spring tension in pounds? Thanks guys... Jim
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Bob from SWISCO responded:

It's tough to tell, but I'm pretty sure this is a 15-175 Pivot Shoe, which uses our Series 152 Coil Balances. Let me know if you have further questions. 

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