Usually I don't cut them. Instead I sit another rock up against it, and within a few days it will move onto the new rock. But if you have cut/fragged it, take a toothpic and stick it thru the lower part of the stalk, so the toothpic sticks out on both sides. Then you can glue or tie the ends of the toothpic to a frag disc or rock, whatever you want. When it has attached to your desired surface, slide the toothpic out.