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S303-15 15" Keller Spiral Balance Assembly

I have a spiral window balance not working properly.

I have a Keller window, do now know which model number but it had spiral balances at one time. The old spiral balances are gone so I have nothing to compare. How can I determine which balance to buy and what hardware, and what length?

Hello, I need to replace the spiral balances in my windows. I need a 15" spiral balance but I am not sure about the shoe or sash guide. I attached 2 pictures. One is the spiral balance. The second picture is of the side of the sash which has a 5/8" channel along the side. It has 2 holes in th ... (cont.)