Constant Force Balance part

A quick learner from MD says:
April 3, 2019
I have a Thermaweld window which was installed in 2010. The window won't stay open. The only information I have is the Coil with a number 8DF engraved on the coil. It is a double hung tilt window.

Will 8 LB SERIES 140 QUICK-TILT, SINGLE Product Code: S140-8 possibly fit to replace the coil balance"?
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Paul from SWISCO responded:
April 4, 2019

Looking at your photos and reading your inquiry, I am inclined to lean toward the S180-8 coil spring as being the replacement. Take a look and get back to us with some thoughts.
8 lb Series 140 Quick-Tilt, Single
8 lb Series 140 Quick-Tilt, Single
S140-08
$8.28
8 lbs Series 180 Coil Balance
8 lbs Series 180 Coil Balance
S180-08
$5.15
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