The L.C. Smith Collectors Association
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Re: Mystery solved
Look at the middle sketch and the note for "steady pin dowel pin" and you will also see the hole drawn across the face of the ejector plate. Inspected my 12 ga ejectors and I can faintly see this second pin on each of those as well.
I only found this after looking at the cracking ejector and wondering what it was that was coming through and then studying the print it all made sense.