Bottom of window arm pivot pin is missing -need a new arm that is on the bottom of the window itself.

Hello there!

Thank you for reaching out to us. I'm afraid I don't recognize the stud bracket shown here at first glance. Would it be possible for us to see it removed from the window? Could we also see a bird's eye view of the entire operator assembly?

Great, thank you! The bracket shown here looks like the 39-160. This looks to be the part you need but review the specifications and see if they match up.

Dimensions for 39-160