Sorry Andy, I’m still not seeing it. Even with your excellent illustrations. Thank you, btw. Sorry I still can’t see it. I understand what you’re saying; I just interpreted the photo completely differently.
I went back yet again to the in-illustrated first photo, and blew it up to full size on the website, then zoomed in on the base and dovetail even more. It looks like at the rear of the sight base, you can actually see the base of the dovetail cut, and it appears to me to line up fine with the sight base’s bottom flair. It actually looks like there is even a little space between the sight base and the extreme acute angle at the bottom of the dovetail cut. If there is anything that is preventing the sight base from drifting further left, it looks like it could only be a burr or something small. Not a step in the sight’s base.
Hopefully we will get a posting of the final outcome.