I have!
That punch thing is just to catch a bigger dimple in the casting. You just pull the metal sleeve up.
Mine was exactly the same as yours, probably a bit worse even, as the flap thing has wedged open and someone had seemingly started the bike with a screwdriver at least once.
Took apart carefully, and straightened all the brass pins. Greased lightly and reassembled and it works great now. But then I did also get another key for it, as the one I had was very worn...