Dolls Head/Rib Extension Fit?

[Keavin Nelson]

A couple of thoughts:
Do we know what the dolls head gap looked like before the hook was reset? Isn't it likely the dolls head experienced wear on the front edges and the gap existed prior to the hook work?

[Dean Romig]

The OP’s fourth picture is about as perfect as it was when it left “that dusty little plant down in Meriden” but I have seen one or two perfecter examples. I have the pics at home on my laptop.
.

[Don Mills]

I am thinking Keavin may be onto something. When the gun was loose as it was closed what should not have been a wearing surface became one. With things loose the front edge of the dogs head would wear against the hardened frame as the gun is closed. This could create wear that becomes evident when the gun is tightened up. Could this be part of the purpose of the dolls head, to keep barrels tight to the breech face? All in all perhaps yet another reason not to leave a gun that is loose that way so unnecessary wear doesn’t occur at the dolls head.