window coils

A quick learner from Millville, PA says:
The windows were manufactured by Greaf. Not quite sure how to get the coils out, do I have put a cut in the back side of the track?
User submitted a photo of window hardware.
Profile picture of Paul
Paul from SWISCO responded:
The manufacturer of this pivot shoe has discontinued it and replaced with the 15-191, which in turn uses our Series 160 coil balance spring. Look this hardware over and see what you think.
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