This is a hammer shaped pine structure weighing 75kg. Its ‘sleeve' the ‘end' of the mallet pushes on the base, called the ‘rear grip'. Its base is intersected by an axis which allows it to pivot vertically. At the other end of the ‘sleeve' is a spur, a piece of metal that the cam strikes. This is how the hammer rises. Underneath the mallet (which measures a metre in length) there are nails that grind the contents of the stack. Every time the hammer falls, the top of the sleeve slides upon another guide the ‘front grip' which acts as a rail to prevent any lateral movement. The mallet is not quite perpendicular to the sleeve, so that when it strikes it, the sleeve rotates the pulp of rags in a similar way to how a baker kneads dough.