Casey from SWISCO responded:
October 8, 2012
Thanks for posting! I agree, this coil spring closely resembles our Series 150 balance. I would also recommend the S150-8, but you might want to double check the weight of your window sash by removing the sash from the window and placing it on a scale. Any common bathroom scale will do. Two S150-8 coil balances working in tandem can carry a window sash weight of 16 pounds.
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Tom from SWISCO responded:
October 9, 2012
Yes, the Series 150 coil springs are approximately 1/2" thick.
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