The easiest way to pull a clip out of a SF body (after unscrewing the head, removing the o-ring, etc.) is to loop a piece of cord (paracord, shoelace, etc.) under the clip and use that to pull the clip out.
Careful with that little plastic spacer. They tend to fly off into the carpet's black hole. :green:
Removing the A2 and K2 clips is a bit different and entails removing the plastic ring that keeps them in place. I've never done that particular removal myself, so I'll let others comment on that one.