Grommet

A home owner from Percy,Illinois says:
This small plastic grommet snaps into the window channel. The hole is for the screw that goes through the top of the spiral balancer to hold it in place.
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Casey from SWISCO responded:

Hello,

The part shown in your photos resembles the 26-200 balance screw plug. Review the dimensions from our product page below to confirm that they match up to yours. Thanks for posting and let us know if you need anything else. Thank you! 

Alternate image for 26-200
Alternate image for 26-200

How to install the 26-200 Screw Plug
How to install the 26-200 Screw Plug
VIDEO
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Modifying the Series 795 Balance
Modifying the Series 795 Balance
GUIDE
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