Tension spring

A handy person from Myrtle Beach SC says:
April 15, 2021
It seems that the springs are worn out.
All other parts function correctly.
Sash weight is 17.5 pounds
Sash= 34.5 W x 27.25L
Wooden windows
Plastic sleeve & track for spring balance and shoe.
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Casey from SWISCO responded:
April 20, 2021

Hello,

Unfortunately, the only part that we can replace from this assembly would be the 15-104 friction shoe. If the springs are worn out, you'll need to contact a local millwork to see if they could have new jamb liners made for your windows. Thanks for posting and good luck with your repair! 
Caradco Friction Shoe
Caradco Friction Shoe
15-104
$1.95
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