Channel balance = Block and tackle removal of window

A quick learner from CT says:
May 23, 2020
The Weathershield windows have 23" Series 800 channel devices. However the windows cannot be removed because they are installed in sash channels that were installed when the old sash weight windows were removed. The house was built in 1922.
Can the replacement sash spring devices be installed into the window sashes without removing the windows?
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Tom from SWISCO responded:
May 28, 2020

I'm not sure what kind of windows you're working with, especially if they were made in 1922, but I can at least tell you that I've never encountered a balance that can be replaced without first removing the sash. I don't think that will be possible.

You should contact a local professional for assistance. It sounds like these windows are going to require a lot of experimentation to work properly and I don't think that will be something we can help with due to the physical limits of our service.
23" Series 800 Channel Balance
23" Series 800 Channel Balance
S800-23
$30.04
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