After shaping a v spring for a drilling (several hours}and flame heating and oil quench and tempering by color and breaking the spring, as a slow learner I tried several more times. Back to the net. One Paragon kiln about $700. Four separate programs: 1. 1472F,2. 580 F , 3&4 for my wife who makes silver jewelry from silver clay (and other metals). Every spring works and so does the jewelry. BTW, the net has replaced Henry VIII and his methods. Way more selections than his six and no beheadings, just press delete.