Coil Balance

A quick learner from USA says:
August 8, 2017
I need to replace the coil balance in a TRACO window. How do I know what "lb" coil I need?
I got the spring out. It's a 7# 35" CMC 408. Attached is a picture of the part. Is this the tandem coil housing 15-086? Do I only need a new spring?

Coil Balance
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Tom from SWISCO responded:
August 11, 2017
Thanks for posting. If the spring has a "7" stamped on it, I would recommend our S180-7. Each of these can carry 7 pounds. You can weigh your sash and divide that by how many springs are used to confirm.

I'm not sure if you only need a new spring, or if you need other parts. It depends on what's broken!
Tandem Coil Housing
Tandem Coil Housing
15-086
$1.68
7 lbs Series 180 Coil Balance
7 lbs Series 180 Coil Balance
S180-07
$4.97
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