Ive heard that about the Squib Rods postino , the one i made on my Lathe was the Bronze valve stem from a Big water valve.
My Gunsmith says to put a rod in any barrel your changing out.
As far as the front site lining up , a German Gunsmith told me that he would get them close so that the Extractor grove lines up perfectly and you get a good amount of torque on the Barrel Flange.
If the site was within a Quarter inch of lining up , they would just go ahead and twist the Barrel a little when the seating was done.
He said before WW2 when he was a kid working at the DMW Factory ,they used a form of shellac on the threads ,and the torque really wasn't all that much on locking in the barrels. It just that all these years of being on those threads is what makes them difficult to remove.
He loved the idea of using High Heat Thread Lock ,but they didn't have that back then .
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