Coiled Balance Spring

A quick learner from CA says:
December 4, 2015
Hi, one of spring was broken, but I couldn't find number near the nail. It's silver color. Could you tell it's 407 or 408. Thanks. Frank
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
December 7, 2015
Thanks for posting! I cant vaguely make out a stamp in your first picture, though I'm not able to read it. That's fine, though. I can calculate what kind of option you should choose, I just need more information.

First, can you confirm how many springs you use on each side? I'm assuming you only have one on each side, but I just want to make sure.

Next, can you tell me the weight of your sash? You can determine this by removing the sash from the window and placing it on a scale. Thanks!
A quick learner from CA says:
December 9, 2015
1. One spring on each side.
2. The sash weighs 19.7 pounds.
3. The stamp in first picture is "CT". I assume it means certainteed.
Profile picture of Tom
Tom from SWISCO responded:
December 10, 2015
Thank you! I recommend our S170-409. I believe this will be able to support your sash weight.
407 Series 170 Coiled Balance Spring
407 Series 170 Coiled Balance Spring
S170-407
$6.55
408 Series 170 Coiled Balance Spring
408 Series 170 Coiled Balance Spring
S170-408
$6.55
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