Unknown Rusted Brown Object on 4 lbs and 5 lbs Series 210 Roller Tilt Balance

Home Owner from New York
I would like to ask what the rusted "screw" looking thing is and when can I purchased this part.
This part goes into the Roller Tilt Balance.
Thank you.
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Tom
Tom from SWISCO
SWISCO
Expert

This part is called a pivot bar. We should be able to get you a good match, but yours is too damaged for me to make out. Do you have an undamaged version we can look at as reference? Maybe from an identical window somewhere else in the house?

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