Window sash tension

A home owner from Glendale says:
Pix is from a 1940 double hung window
window tension
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting. This type of wood window seems like it works on the same principle as our 20-001 tension spring with the exception of ours being attached to the actual sash. I encourage you to review our part along with the production description for further details.
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