I have been watching this waiting to see if anyone spotted the problem. The problem is in the bearing. Not the rod as one person actually fitted older used shells and they lined up.
The problem is at the tang end. Something we saw sometime ago and either fix or use another bearing type.
Here is a test to do. Push the shell into the cap (all the way) and rotate it so the tang is out of the cap. Now see if the bearing positions itself differently. Then look to see why the bearing re positions itself when the tang is engaged.
Simple to fix if you see the problem.
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