Is the 20-001 installed at the top or bottom of the sash?

A handy person from Wisconsin says:
March 20, 2011
Is the tension spring 20-001 secured at the top of the sash or the bottom of the sash?
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Dave Sr. from SWISCO responded:
March 22, 2011
The 20-001 is installed on the top of the bottom sash and the bottom of the top sash. If it is installed on the top of the top sash it will interfere with the chain pulley in the track.
Wood Window Sash Tension Spring
Wood Window Sash Tension Spring
20-001
$3.20
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