Silver line 8500 series

A quick learner from Essex ct says:
January 18, 2020
No markings on coil for LB s. 1.5 in wide. 1/2 in or 9/16 thick. Looks like your s180 spring. Single coil. Need about 10.
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Bob from SWISCO responded:
January 21, 2020

Thanks for writing. This does indeed look like our Series 180 Coil Springs along with the 15-087 Housing Shoe. If there are no stamps on the springs, weigh your window sash. Give us that exact weight, and we'll work out what you need.
A quick learner from Essex ct says:
January 22, 2020
weight of window sash is 15 pounds.
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Bob from SWISCO responded:
January 22, 2020

Thank you. You can go with the S180-8 coil spring. Take a look and let us know if any other questions come up. 
Coil Housing Pivot
Coil Housing Pivot
15-087
$5.97
Mounting Bracket
Mounting Bracket
16-024
$0.66
#8 x 3/8" SS Pan Head Philips Screw
#8 x 3/8" SS Pan Head Philips Screw
33-072
$0.30
8 lbs Series 180 Coil Balance
8 lbs Series 180 Coil Balance
S180-08
$5.15
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