You tap out the center pin with a punch. There are 4 fingers that get spread with the center pin, so they come in towards the center and the clip comes off the body. However after 58 years they get brittle and often break. I’ve had some luck spraying with lube first.
If you can get to the other side, maybe only 20% of them, and gently pull those 4 finger to the center and they may come out easier.
they don’t fold over in half.