Tilt Window spring assembly

A home owner from Groton, Ct says:
November 12, 2017
This is the left spring / corded tilt window mechanism. The lower pulley broke. I expect i need a total replacement. Note window 3 is the attachment for the lock mechanism still in the window.....i can move it to a new cord if required.

Suggestions??

Thanks
Channel Balance
User submitted image of their window hardware.
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Paul from SWISCO responded:
November 16, 2017
To further help you in identifying your tilt balance, we need to know how you attach the balance to the window. Also, how long is the metal channel, and what imprint stamped on it? We need to see the clip at the end of the cord, as well. The second photo, where your spring is attached to that rivet, is very unusual, and we want to figure out what's going on.
A quick learner from Groton Ct says:
November 16, 2017
The channel is attached to the top of the window casing thru the hole you see in pic 1 of the metal channel.

There are two rivets on the metal channel...which is about 40" long. The third photo shows the bottom pulls which is attached to a similar rivet on the bottom of the metal channel (note the bottom pulley broke off at the rivet. the long cord from the top pulley hooks on to the sliding (rotating) lock at the bottom of the window.

I agree its unusual thus my question:)
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Paul from SWISCO responded:
November 21, 2017
Thank you for clarifying! If your balance attaches to the top using a screw, then I would recommend our Series 770 channel balance. This looks like the best match we have, and even has the same style clip at the end of the cord. See what you think.
40" Series 770 Balance
40" Series 770 Balance
S770-40
$14.20
How to replace a tilt-window channel balance.
How to replace a tilt-window channel balance.
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