Window balancer for double hang wood windows

A quick learner from Boston says:
July 18, 2019
Hi, my bottom windows don't open. We took them apart and removed the part we think is broken (last picture) could you please help us identify it? The length is 25 inches. Thanks
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Casey from SWISCO responded:
July 25, 2019

Thanks for the inquiry. It looks to me like you could use a new S751-27 channel balance. Give it a glance to be sure you agree, though!
27" Series 751 Channel Balance
27" Series 751 Channel Balance
S751-27
$11.63
How to install a ribbed tilt channel balance with knife lock shoe
How to install a ribbed tilt channel balance with knife lock shoe
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