I was very careful when reducing the repair pin to allow the firing pin and retainer to pass, so there'd be as much contact as possible between the pin and the lug on the firing pin retainer.
The stock arrangement allowed some wiggle in the fit of the retainer in the breechblock, which could create very little for the retainer lug to bear against.
I think the repaired breechblock is considerably stronger where the retainer locks into it.
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