I am thinking about building a crack off machine. I have seen a couple in person and the fab side of it would be cake work for me. I am wondering about the hydrogen torch that goes inside the tube and also the diamond bitthey use to score it, i assume its the same type of diamond bit that is used to dress grinding wheels. I dont want to pay 5-6k for one from a store when i can build all the frame work myself. I alrady have a supply of pillow blocks, steel, pulley, gears and stepper motors. Any info anyone wants to share would be great. thanks.