Casey from SWISCO responded:
February 1, 2023
Hello, Take a look and compare the specifications of the 15-263 pivot shoe to yours. Unfortunately, we do not carry 5.5-pound springs for this assembly but you should be able to use one S195-4 coil on each side of the window to support your 10-pound sash. Take a look and see what you think. Dimensions for 15-263
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