Several of my window springs are failing

A home owner from Houston Texas says:
April 18, 2015
I have several windows of different sizes that are all failing regarding the spiral springs. We use them often. The builder used cheap material so I am thinking about upgrading my springs. They currently have a green tip, non-tilt, 3/8 tube diameter and 28.5 inches long. I did not see any options of that length or where the tip color is chosen during the order process. Any help would be appreciated.

Thanks.
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Paul from SWISCO responded:
April 20, 2015
Hello! Can you confirm the length of the tube? All things told, it sounds like you have our Series 400 spiral balance, but they aren't made in lengths on the 1/2". If you are certain it is, may I suggest moving up to 29"? That may also work. The S400-29 also has a Green Tip option available.
29" Series 400 Spiral Balance
29" Series 400 Spiral Balance
S400-29
$10.73
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How to Identify a Replacement Spiral Balance
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