Broken sash balance

A quick learner from Hendersonville TN says:
I need a replacement on my 36 inch sash balance please. I need two. Thank you!
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Lauren from SWISCO responded:

Hello, thank you for posting,

Please start by reviewing the S770-36 channel balance with a 36C stamp option. This balance installs with a screw at the top through the metal channel. I cannot confirm how yours installs from the photo. If yours installs differently, please let me know and provide pictures of the top of the balance. Thank you! 

How to replace a tilt-window channel balance.
How to replace a tilt-window channel balance.
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