Pettingell Power Hammer: This equipment is the tool most commonly found in America for manufacturing early automobiles and aeronautics. It is still used today in custom shops to shape metal in three dimensional planes. Outwardly appearing to be a violent hammering machine, it has subtle capability. With proper finesse by the operator, it has the benefit of both stretching and shrinking sheet metal. In doing so larger panels can be created than that by an English Wheel. This reduces the amount of welding necessary to any fabrication.