Also, a side note. I designed a double horn anvil a while back, which had a radiused edge and shallow square holes for inserting stock to be twisted. I am concerned that the twisting holes will reduce the strength of the bic resulting in a possible crack. In other words, I don't know if heavy pounding on the bic will create a fracture where the holes are, since the waist of the anvil descends under them. Have you guys seen any type of reinforcement on the bottom of a horn to add mass, or maybe a spine which will allow it to stand up to heavy pounding?