I have read articles relating to old time gunmaking where they refered to "Soft fitting" & "Hard fitting". The soft fitting was done prior to case hardening & was by filing etc to get proper fit. Hard fitting was done after the casing & consisted of "Bending" back into place, "Hammering ie". This was the makers doing this.


Miller/TN
I Didn't Say Everything I Said, Yogi Berra