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
Bob from SWISCO responded:
September 22, 2020
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.