Help with a channel balance

A home owner from Columbia Mo says:
July 29, 2017
I believe that the S770 is the channel balance I need but not for sure. Have attached pictures of it installed in window. But not sure how to remove window in order to remove the channel.

It is stamped with 34B. The channel measure 34 inches

Any suggestions or advice you could give would be great.
Window hardware
Profile picture of Tom
Tom from SWISCO responded:
August 2, 2017
I'm afraid I can't confirm if the Series 770 is a match. Did you see our video on how to replace it? That may shed some light on what you need to do.
34" Series 770 Balance
34" Series 770 Balance
S770-34
$13.77
How to replace a tilt-window channel balance.
How to replace a tilt-window channel balance.
VIDEO
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