Window spring balance identification

Handy Person from Pennsylvania
Looking to ID this to find a replacement.
Channel is 34" long
Stamped 34C BSI AH
The top Part of the channel was screwed into the top of the window channel. I didn't see any plastic piece or remnants of a plastic piece for the top part.
Nothing was connected to the bottom on the broken side.
Is there any hope to narrow it down just on the top part and markings alone? I don't have an image of the bottom of the channel from the good side at the moment.
5 user uploaded images
4 Replies
Jasmine
Jasmine from SWISCO
SWISCO
Expert

Thanks for writing in! I am confident we can provide you with the replacement balances you need. Although, to ensure we are providing you with the correct assembly for your window, I'll also need to see a photo of how the balance attaches to the window track at the top of the window.

Please let me know if you have any questions in the meantime.

Handy Person from Pennsylvania
Hi this is the top of the channel, it was screwed into the window at the top
1 user uploaded image
Jasmine
Jasmine from SWISCO
SWISCO
Expert

Thanks for the additional photo. Your balance can be replaced with the S770-34 Balance with a 34C stamp option. This is compatible with the 15-129 Pivot Shoe.

Detail of 15-129
Detail of 15-129

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