Balance springs

Question

The spring has 2 holes on the end that attaches to the jamb
with clip-1 screw.
How to release the broken piece of spring to replace with your new?
No name or visible numbers.
Replacement type windows with the aluminum grids
Inside the glass.

User submitted a photo of a window balance.

Paul · Accepted Answer

This looks like our 15-087 coil housing pivot, which is meant to be used with the Series 180 coil spring. You need to remove the pivot housing from the window track and take it apart to see the number stamped on the old coil spring to determine the best Series 180 option.