Replace coil spring of single hung window (both sides)

A home owner says:
Window sash dimensions: 34"W x 30"H
Weight: about 20 lb
Coil spring width: 1/2" (no stamps or numbers on the broken coil spring)
Accessories: reuse the existing ones
Please help select the right product to purchase and install.
Let me know if you need more information. Thank you.
User submitted a photo of a coil balance.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting. It's hard to tell exactly what you have based on this image. However, you could look at our S190-832 and see if this is a possible match. Let me know if you agree.
A quick learner from Princeton, New Jersey says:
Yes S190-832 is the right product for the window because I found the number 832 on the existing coil spring after receiving your e-mail. I have already put the order.

Please provide the installation tips, particularly how to put the window sash back after getting the coil spring assembly in the cutout area.

Thank you very much.
Profile picture of Paul
Paul from SWISCO responded:
Sure! Check out our handy video tutorial which shows how to replace a window coil balance. Now, this video doesn't feature the same coil spring as yours, but the same principles apply.
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