Window Coils for 30 lb. sash

A handy person from Cumming, GA says:
January 6, 2012
I need several replacement coils for double hung windows. The panel dimensions are 33.25 X 35.5", double insulated. The actual weight of each panel is 30 pounds. I have 16 windows that need replacement. The old coils were 5 pounds each, with four on each window. Several of the windows currently fall as if nothing is even slowing them down, others fall a little more slowly. I have attached an image of an old coil. Please let me know what I need with pricing (I am assuming 7 lb. coils, with four on each window, for sixteen windows).
User submitted picture of coil balance.
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Paul from SWISCO responded:
January 10, 2012
I agree, I think that our S190-740 Coil Balance Springs would be best. You will need two on each side of the window, and our 15-180 as the coil balance shoe.
A quick learner says:
January 10, 2012
What is the difference between the 190 and 152 series coils, and why would I choose one over the other?
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Paul from SWISCO responded:
January 11, 2012
Based on your picture, your coil balance matches our 190 Series. We highly recommend that you replace your hardware with something identical or very similar. The preferred shoe for the Series 190 is the 15-180.

If you you are still unsure, you may submit additional pictures of your balance and shoe from different angles so that we can determine other options.
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