The technical term is "incipient" case head separation.
You can see it on the outside as a bright ring, sometimes, and you can feel it with a metal pic (straightened paper clip) on the inside, once you know what it feels like.
Still happily answering to the call-sign Peetza.
You do not HAVE a soul. You ARE a soul. You HAVE a body.
He is no fool who gives what he can not keep to gain what he can not lose.
-Jim Eliott, paraphrasing Philip Henry.