Anatomy of a razor, hinge pieces, name?

[VR6ofpain]

What is the name of the hinge piece on the ends (not the safety bars) of TTO razors? I noticed this to be one of the more solid pieces of the British Gillette razors. They have one sold bar with pins sticking out of each end, whereas most American Gillette razors use two pieces of bent steel, where the tip of each piece is the pin, and a cover plate is usually "glued" over it, for a cleaner look (though this was not done on older razors, like my Senator).

Here are some photos of what I am talking about:

English Gillette's with solid piece:


American Gillette's with two pieces, missing cover:



American Gillette with two pieces and cover:


Something I noticed was that the American Gillette Super Adjustable razors also have the solid (British) end piece design. This is interesting, because in a way this means the head of this razor is superior to that off the Slim and Fatboy's, if you are a follower of the British razor design being more Heavy Duty.

Here is a pic of the solid end piece of a Super Adjustable:

[VR6ofpain]

Seems even the later Superspeed's also used the solid end piece construction.

A 1965 SS:


A 1972 SS:


Does anyone know what year they switched over to this design? I know I have seen SS's from the early 1960's that still used the bent pieces with the cover plate.

[VR6ofpain]

Found more photos:
1950's SS, w/ two piece and cover plate:


Another photo of the two piece w/ cover plate (black tip SS):