A bit of an update:
We've been discussing Uberti Colt repros and the lack of the relief flat on the arbor that seems a new feature?
Well, I went and disassembled a couple of older Pietta Colts. They have the relief flat.
Then I checked three of my newer Pietta Colts......
THEY ALSO DID NOT HAVE THE RELIEF CUTS -- JUST LIKE THE NEWER UBERTIS!
One thing I also checked, on two of three Piettas, no lock ups or mechanical problems resulted when the gun was cocked disassembled.
On one, the bolt would not come up until manually pressed but then it worked. All three guns worked well assembled, but then I always knew that anyway.
It seems to me these Italian companies must have done this as I theorized earlier, as a time/cost saving measure.
Or .... coincidence? Evil trilateral conspiracy? Naaaw, that's too far. Too Alex Jonesy.
But ....sorta interesting, I guess.