I tried a finish nail to make a punch but its to soft. I resorted to a punch to drive out the pins make sure the punch is smaller than the pins in diameter. I recommend a small vice grip to hold your punch the vice grips can take a lot more beatings than your hands or fingers
I just drove the pin almost out and stopped
Here is the plate free and the chain will now come apart. Notice no black and blue fingernails. The vice grips sure come in handy to hold the chain but you can do it with out the vice grips. But the cussing will make the neighbors up set.