Lauren from SWISCO responded:
July 5, 2023
Hello, thank you for posting, Yes, the number on the metal coil indicates the weight option. Please start by reviewing the style and dimensions of the S140-6 coil balance assembly to see how it compares to your original. One assembly on each side will support a 12 pound window sash. Let us know what you think and if you have any additional questions! Alternate image for S140-6
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