Rod to help hold window open

A handy person from Plant City Florida says:
What is the actual name of this part, and is it available? Thank you
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Lauren from SWISCO responded:

Hello, thank you for posting,

What you are showing is a spiral balance. To move forward, can you please provide the diameter and length of the metal tube? We will also need to see a closer picture of the bottom of the spiral. Is this window tilt in or non-tilt? Thank you! 

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