double
Sir;
Your underlugs can be repaired by judiciously cutting them out and new steel brazed in and re-fit.
Some try to "peen" the lugs as apparently is yours but it lasts for a short time.
The hole into the barrel, if it is in fact, is different.
The locking lever ought to rest when fully locked just to the right of center.
If the hole is truly centered in the rib between the barrels it's of no consequence.
Harry B.
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