Spiral balance in white sleeve

A home owner from Minneapolis says:
Hi I have a spiral balance from an unknown mfg window that is inside a white plastic sleeve, which does not seem to come off. I can see the blue tip inside the end of the sleeve. The sleeve measures 9/16" and 21" long but if I had to guess the rod inside (not counting the tip) would be 20". It is from a double hung tilt out window. Can you direct me toward the right product for this?
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Michael from SWISCO responded:

Thank you for submitting your inquiry to our discussion board.

Take a look at our 21 inch Series 600 spiral balance with the blue tip and see if this will work for you.

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