Cal. 321 Part number Inquiry

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I have looked over the various documentation for the 321 on Cousins and other videos and I am having a hard time finding the name or part number for this screw:
The screw that the operating lever (1720) butts up against.


Thanks for your help!

 
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I don't have one in front of me, but I believe it is 2812...

 
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Im realizing I need to be looking at the 320 vs the 321 for the bulk of the movement!

Thanks again for you quick and helpful replies on these movements!