window coil spring

A home owner from Charleston, SC says:
November 5, 2018
Hello, I'm trying to replace a couple of window coil springs for lower sashes. I've attached three photos but it seems many look very much the same. There were no identifying numbers or letters stamped on the coil. Any help you can offer would be appreciated. Thank you.
Tim
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Paul from SWISCO responded:
November 13, 2018

Welcome to SWISCO, Tim. Starting with your pivot shoe, our 15-+175 may be a good fit. Take a look over our measurements to confirm this is correct. This is used with the Series 152 coil spring. Since there are no stampings or marking on your current coil, you will need to get back to us with the weight of your window sash and we'll go from there. 
A home owner from Charleston, SC says:
November 14, 2018
Thank you again for your help with this. The window sash is 19 lbs. Please let me know what series 152 coil spring you would recommend for this. Thank you.
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Paul from SWISCO responded:
November 15, 2018

You should be able to use the S152-9 coil for your sash. 
9 lb Series 152 Coil Balance
9 lb Series 152 Coil Balance
S152-9
$5.15
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