tension spring install for window sash

A home owner from Wisconsin says:
May 25, 2010
I have ordered two 20-001 to install on a window that has broken cords. Do I need to remove the broken cords or can I just leave them?
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Paul from SWISCO responded:
May 27, 2010
First, try raising the sash to see if its binding with the cord. If not, install spring.
Wood Window Sash Tension Spring
Wood Window Sash Tension Spring
20-001
$3.20
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