I spent some time at Guedelon in France where they are building a chateau using only the materials and techniques from the 12th century. They have blacksmiths

I spent some time at Guedelon in France where they are building a chateau using only the materials and techniques from the 12th century. They have blacksmiths making nails by hand. One blacksmith told us he'd spent the best part of a day making one nail that ended up being a failure.