We start by fully disassembling the bolt assembly and with bolt gripped between padded jaws in a vise, we carefully stone the “Volcano” down to normal bolt face level. But, No More! A small stone, laid flat on the bolt face, can easily remove the raised area with a moderate amount of pressure and rubbing back and forth. But don’t take too much, as excessive headspace problems can arise if too much is removed from original bolt face. After that is done, we use an 82 degree countersink bit, between the thumb and forefinger, and with hand pressure only, we very slightly countersink the firing pin hole. Ten to fifteen thousandths deep is plenty. This will create a tiny raised edge around the firing pin hole, so again, lay the stone on bolt face and very lightly remove the ring that you created. That’s it.