Hey Aries,I think you could use a torch. To get the hole through you heat the spike red where you want the hole and drive a chisel through, it will take a few heats and keep cooling the chisel about every 5 blows. once you get the hole opened up with the chisel heat it red again and drive a tomahawk drift in the hole from the top of the spike. A drift is a piece of ductal iron shaped and tapered to shape the hole.