Double hung window part

A home owner from Illinois says:
located on bottom of upper sash
Pin held on by 2 screws that goes into the spring mechanism
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Tom from SWISCO responded:

Good morning! I would start by carefully comparing the dimensions to our 26-412 pivot bar to your own. This looks very similar to me but it will come down to size. If they differ, let me know how and I'll try to find something better.

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