Searching for Tech 2000 1712. Balance spring

A quick learner says:
Broken balance spring on left side of sash that needs to be replaced. Need removal and replacement instructions as well. Thank you.
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Casey from SWISCO responded:

Hello,

It looks like your balance assembly might be stamped with 6R. If so, I would recommend removing your balance assembly from the window to compare to the specifications of the S140-6 shown below. Thanks for posting!

Alternate image for S140-6
Alternate image for S140-6

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