(Not a device for removing wrinkles from your bacon.) A term applied to the counterweights (pig weight) used in a counterweight fly system. Actually a type of metal, or a step in the process of turning iron into steel. So named because as the molten iron is poured from the crucible into ingots, they resemble piglets suckling at their mother.
http://northernwall.blogspot.com/2011/07/pig-iron-reprise.html
http://northernwall.blogspot.com/2011/07/pig-iron-reprise.html