Parts

A quick learner says:
Need replacement parts
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Casey from SWISCO responded:

Hello,

I can't be sure with the coil balance still installed but I would recommend starting by removing your assembly from the window to compare to the S161-08. We'll include the dimensions from our product page below. Take a look and see what you think. Thank you! 

Alternate image for S161-08
Alternate image for S161-08

A quick learner says:
Yes I would say the 161-8 would work but is it possible to change the coil spring with the 180-8 the only question I have is what is holding the spring on the top
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Casey from SWISCO responded:

Yes, the S161-08 is used with the 15/32" wide S180-8 coil spring. We also offer the 16-031 mounting bracket, which installs above the coil balance to attach the coil springs. 

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How to Replace a Triple Coil Balance System
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