Coil spring balance

A quick learner from Torrance California says:
August 15, 2017
Coil spring balance
I have a dual coil spring balance I believe is off of a Certainteed window not positive .
The spring has a 7BG stamped on it

Thank you very much for your help

User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
August 21, 2017
I'm afraid I don't recognize this spring. Could you show me a picture of the pivot shoe to which it connects?
14 lb Series 140 Quick-Tilt, Dual
14 lb Series 140 Quick-Tilt, Dual
S140-14
$12.58
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