OK. lift the window 1 inch. Release the tilt out latches, tilt the window 90 degrees to the frame. Tilt the window so the good spring side is up all the way and the bad one down. Keep lowering the bad one until the window retaining ears slip out of the spring blocks.
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I do not have a tilt window but your advice gave me an idea. There were inserts in the top of the window track and when I took them out I could disconnect the spring. I am accepting because you were on the right track, no pun intended.