Coil balancer

A home owner from Tacoma Washington says:
5/8th thick, has 3 coils put together and holds up a 30 pound single hung tilt window
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A home owner from Tacoma Washington says:
The coils are connected together so that just one hooks into the side of the window.
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Emily from SWISCO responded:

Thanks for reaching out to us! I recommend our 15-087 pivot shoe and 15-086 housing. With a 30-pound sash, you can use one S180-9 9-pound spring and one S180-6 6-pound spring on both sides of the window. Having 15 pounds of support on each side of the window sash will total 30 pounds of overall support. 

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