Help please - single hung window part

A quick learner from Port Royal SC says:
Single hung window ... plastic piece at bottom with string attached up to a track
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
I believe our S775-29 balance is the replacement for your current balance. Take a look. Does this look about right to you?
How to install a S775 balance
How to install a S775 balance
GUIDE
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