Gene, as best as I could tell the flipper piece was riveted in place too. There is no obvious attachment piece other then the post that it's attached too. The lever that cocks the hammer looks pretty stout if it's still there I would think someone good with a welder could tig it back up or straighten it if it's bent.

I am hopeful that I never have to take that hammer spring out again, in my lifetime. I am sure someone has a trick to get it in or out. Maybe an arbor press set up to depress is while someone holds the rifle upright underneath it?