Deep down in the ground, about 5 feet deep in the layer that has the insulators, plaster moulds, and clay; I kept finding these golf ball sized pieces of flint stuck in these huge masses of the porcelain clay. The rocks looked like they had been polished. It then dawned on me that these were the stones that New Lexington was using in their ball mills! Absolutely incredible! This is the first time anyone in the hobby has found the actual components used for processing porcelain insulators. Modern ball mills use high alumina spheres that minimize the contamination. It is interesting comparing the old insulator manufacturing methods to the modern day technology. You might say the insulators New Lexington made worked...