Broken balance

A quick learner says:
June 13, 2017
Measures 29" balancer with twine as tension string.
What to use ?
1/2 pivot shoe and 29 " #600 balancer ?
User submitted image of their window hardware.
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Paul from SWISCO responded:
June 16, 2017
This is not a Series 600 balance. That is a spiral balance, while yours appears to be a channel balance. See our S770-29, I think you'll find this is a closer match.
Pivot Locking Shoe, 1/2" Thick
Pivot Locking Shoe, 1/2" Thick
15-135
$2.57
29" Series 770 Balance
29" Series 770 Balance
S770-29
$12.80
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