Click to enlarge.
PB-- sorry about being slow to get back to you, but today was dentist visit day. Here a photo of one I just took apart. When you do that, take the bolt apart and take the safety out of the sleeve it is best done much like Ed described it. I used a scribe. Position the safety wing in the vertical position between the two dimples that receive the plunger when it is completely on or off safe. Work the sharp point in between the plunger and the bottom of the groove, wiggle and push until the plunger is depressed into it's hole. Now the surprise, the safety will come off to the rear over the back ridge of the groove. If you've got a scribe pushed in there tightly you can actually facilitate matters by tapping the safety wing toward the rear with a little non-marring hammer. When you get it out you will find that the plunger is held captive by the safety's shaft. Well, at least you don't have to search for it under your bench or across the room.
Closer inspection will reveal that the shaft is driven into and through the rounded bottom of the safety. This is sometimes difficult to see because the part was polished and the exterior of the joint obscured, but maybe holding it to the light and rolling it back and forth a bit will let you spot it, or you could even get some fine W&D paper and sand it a bit to see it. Then, if your thought processes work like mine, you will say, "Well, I could pound the shaft out and remove the plunger, spring, old oil crud that might be restricting the spring's ability to compress, or replace the spring if necessary, and reverse reassemble." If you do that you'll have to get the shaft back in exactly right because you'll note that the end that enters the sleeve is cut a certain way so as to mate with an internal groove in the top interior of the bolt sleeve when turned one way, to either allow or prevent movement of the cocking knob and firing pin extension. So look at it carefully and put it back the same way.
What will the end result be? I'm not sure, because I've never done one. I would have some apprehension about the safety's shaft remaining tight in the safety's wing after being removed and then replaced because of the hole being enlarged in the removal/replacement operation. It is possible that the application of heat to the safety wing might aid in removal and replacement. It is also possible that it may have been soldered in place. So, the way my mind works, it's much easier to just replace the part. Can't be very expensive. Go to e-bay, type "Krag" in "search" and you'll be surprised what comes up. Many parts. Go back and do it again a week later and half of them will have changed/rolled over to a different selection, different prices. Or, just order one from one of the parts houses.
My advice, sir.
DG