Quoted:
I have been fiddling for about an hour with trying to re insert the extractor retaining pin with the BCM Extractor spring... I have watched videos on how to put it back but there is no way it should be this difficult.
Is there a secret to it? Any helpful tips would be appreciated.
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Hopefully you've got this solved since it has been weeks, but here's my $0.02.
The o-ring is generally not needed if you are using a strong extractor spring, like the BCM spring. So if you ditch the o-ring it will be much easier.
Then, the extractor does not usually sit all the way back in the extractor cut-out groove. It sits just a hair forward of that. If you are putting the extractor all the way back into the groove, the pin will not want to go in.
It helps to use a a punch (that is smaller than the hole) from the other side. Put it in and wiggle it around and it will center everything up. Then slide the pin in from the other side.
Make sure you have some lube on the parts as well.