adjusting friction shoe

A home owner from Philadelphia says:
Double hung windows - 20 years old. When I unlock the window, the top sash immediately falls approx 4-6 inches on many of the windows. Do I adjust the friction shoe by turning the screw clockwise ? Thank you. Mark
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Paul from SWISCO responded:
If you turn the screw clock wise, it should add pressure to the spring, which should in turn help your situation. Let me know if that works out.
A home owner from Philly burbs says:
Thanks Paul, I appreciate the response. I've cranked the screw down clockwise until I screams "uncle". No affect on the window dropping.

I've got a spring tension jig that I rigged up to test the tension of those springs. I guess that's my "final answer", right ?

Any other thoughts ?
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Paul from SWISCO responded:
Hmmm... I'm not sure what else you can do. It's possible you just need a new shoe. It might be too worn to adjust.
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