Kensington hop window balance

A quick learner from Chicago says:
Window goes up but slides down. Window balance metal broken and plastic cracked.window size w29 1/4 by 34 3/4 long it's a kensington hpp.
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Casey from SWISCO responded:

Hello,

I can't be sure with the original hardware still installed but what I can see reminds me of the S140-13 coil balance. I would recommend removing your assembly to compare to the specifications below. We'll also relate a few videos on this page to help you through the process. Thank you! 

Alternate image for S140-13
Alternate image for S140-13

How to Replace a Triple Coil Balance System
How to Replace a Triple Coil Balance System
VIDEO
WATCH >
Removing a Triple Coil Window Balance
Removing a Triple Coil Window Balance
GUIDE
READ >
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