Window can't be removed; how do I replace balance?

A quick learner from Gulfport, MS says:
Existing windows have the 17" Series 400 Spiral Balance.

There is not a removable metal bracket on the bottom of the window. There appears to be metal bracket up in side the side frame of the window that could only be removed by taking the window sash out of the frame which appears to be impossible. Please see photo lookig op into the side frame.
Given all that, my question is can I just replace the spiral balance?

Thank you,
A customer submitted photo of a window sash.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for contacting us, Frank. This is a good question, and a tricky problem.

First, I recommend that you look at our 75-005 Spiral Balance Charging Tool for Non-tilt Windows. With this tool, you can hook onto the old balance from the bottom then and then detach it from the shoe. Next, you will want to unscrew the balance at the top and pull it out from the bottom while someone else holds up the sash.

To install the new balance, slide it up behind the sash and between the shoe. You will once again want someone to hold up the sash as you do this. Screw in the top of the balance and finish up by charging it with our 75-005 tool.
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