Clear plastic part that I believe stops the window

A home owner from Waterloo Iowa says:
Plastic stop It stops the window where the tilt mechanism doesn't go to far up.
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Bob from SWISCO responded:

Hello there. This is actually not a window stop. It's a mounting bracket for a Coil Balance system, most likely our Series 180. See the image below that shows how this type of bracket (the 16-024 in the image, but the similar 16-031 looks closer to what you have and functions the same way) installs in relation to the rest of the assembly. 

Series 180 coil balance diagram
Series 180 coil balance diagram

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