Mine came loose with the safety on.
I had read about this happening in the past, so knew what it was and didn't panic. I was concerned that there was a live round in the chamber, and I could neither fire it, or eject it from the jammed safety. I was able to get the safety to the ready position and fire the round.
Anyway, I asked a friend if he had a staker tool and he did. Saved me having to buy the Gunrunner staking tool from Brownells. What I did, was clean up the plunger tube, and the holes, chamfer the holes a bit more, and re install.
Should I have replace it with a new one?? I suppose if it comes off again I'll have answered my own question. I bought this gun second hand almost 30 years ago, and this is the first real issue I have had with it. There were 700 rounds but through this firearm since June 30th.
Shiloh