window regulator mystery part

My passenger side front window got stuck 2" down from the top and won't move at all. I removed the door card and found this little part lying in the bottom of the door. It's only about 1/2", grey pot metal. Looks important! Any idea where it goes?

My passenger side front window got stuck 2" down from the top and won't move at all. I removed the door card and found this little part lying in the bottom of the door.

It's only about 1/2", grey pot metal.

Looks important! Any idea where it goes?

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