When pinning (and peening) fragile material (like MOP), use very soft pin material.
Great point Joe. I forgot all about saying anything regarding soft peening material. My preference is silver and if I am out, I use aluminum. And I have to be in a pinch to use aluminum. It just doesn't quite measure up for some reason.

Didn't mean to give the appearance of stepping on you toes with the advice. I am not saying that you are not correct, I just prefer to do it the way I was talking about. Your way is definitely safer. Much safer. I was probably writing an answer about the same time you were. You hit enter first. Must be a premature edification thing... or you just type faster