Yeah, I lack that skill. I remember seeing somewhere, deep in the bowels how to save them, but I was never able to pull it off. Plus, they are the Solingen style washer, and not that worthy (in my opinion) of saving. But I can be convinced otherwise!
If they are not anything special then drill them out. It may be a good opportunity to practice just drilling the pin for the time when you do want to save the collars.