Single coil size

A quick learner from ridgefield NJ says:
June 3, 2019
Hi
coil broken and i am not sure which one should i get.
thickness of the coil is half inches but what should be the correct length?
attached my broken coil and window
plastic parts are in good condition.
i think i just need to screw the new coil
thank you for your help
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Bob from SWISCO responded:
June 5, 2019

Thanks for posting. Take a look at our Series 152 Coil Balances. Don't worry about length: you simply need to know how much spring weight you need. Look for a stamp number somewhere near the tongue of the coil spring; this should indicate the spring weight you need. Let us know if you have any questions.
Coil Balance Shoe, Slate Blue
Coil Balance Shoe, Slate Blue
15-177
$3.47
#8 x 3/8" SS Pan Head Philips Screw
#8 x 3/8" SS Pan Head Philips Screw
33-072
$0.30
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