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A distributor from Seattle, WA says:
The Black plastic corner connector in attached photo is your part #23-409. I need the part # for the pivot(?) that is circled in red. Thank you.
Troy
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Bob from SWISCO responded:

Thanks for posting. It's a bit difficult to make out from this photo, but it looks like this might be the 21-092 Driver Bottom Pivot, which goes into the 23-409 Corner Connector. Take a look, carefully compare with your old hardware, and let me know what you think.

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