The Mechanismo pic clearly shows a screw 180° from that point on the clamp.
There are higher resolution versions of the reference pictures, but not publicly available. Master Replicas had access to those pictures in color I’ve been told. That is why their replica had brass screws, and it was taken as a fact at the time It was produced. I’m always up for a debate about the details, it sometimes shakes loose better reference pics, or cropped sections at least.
View attachment 1397090
From page 67 posted by
Sym-Cha
View attachment 1397092
MR ANH Weathered from Galaxie-Starwars.com
View attachment 1397094
MR ANH weathered from Statueforum.com
There is also another wire (cotter pin) 180° from the easily seen one in the double hole on the clamp, you can
just see it at the bottom of the Mechanismo pic.