I had done some metal sculpture-wrought iron work before I took the Covell class, I usually tried to build a wood form then gradually work the metal into the final shape. Ron torch carboned the aluminum sheet then flamed it off to anneal it, then as described above beat walnut bumps in it, I had hammered a lot of crash body panels and wondered what he was doing, I was amazed how fast Ron wheeled it smooth. A few years ago I took a semester class at UVU, street rod-panel fabrication. They had a large power hammer, the one with the short leaf springs and leather straps in the mechanism. It has sat in the shop for a couple years with out much use. the instructor worked some 18 ga steel with a doming die and a leather covered bottom anvil die. It came out very smooth.