Constant force coil spring balances

A contractor from Raleigh, NC says:
April 26, 2019
I need one left hand and one right hand coil balance. It may be hard to see in the photo but the number "8" is stamped onto each spring.
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Bob from SWISCO responded:
April 26, 2019

Thanks for writing in. Your pivot shoe resembles are 15-180. This is compatible with our Series 190 Coil Balances. To know what spring weights to select, look for stamp codes on your coil springs. It appears there is an '8' on one of your coil springs--this would indicate that you need an S190-840 (for 8 lbs of support) on each side of your sash. Let us know if you have any questions.
Coil Balance Shoe
Coil Balance Shoe
15-180
$3.97
840 S190 Coil Balance Spring
840 S190 Coil Balance Spring
S190-840
$11.32
Double Support Detent Clip
Double Support Detent Clip
15-181
$6.17
Coil Balance Clip
Coil Balance Clip
15-186
$5.05
Balance Bushing
Balance Bushing
15-182
$1.80
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