Thats all I can think about. all the rock I have made into rubble. Guess you cant learn unless you try. I have tried and tried percussion without control. Just trying to figure out where to make my next strike but without something to control it I am getting frustrated. I see and understand what I am trying to do but I am hoping this little method will bring it all to fruition. cant wait to get home and give it a try. I am wondering if I can do the same with a piece of antler. Where to get copper eludes me.