Bronze "poured" terminals

I recently found these old Wilcox and Crittenden terminals on e-bay from a guy in California. They are also called speltor sockets. Wires are placed in the cone shaped terminals. Once inside the cone the wired is frayed or "broomed". Molten zinc is poured in the cone and allowed to harden. A plug forms around the frayed wire. This type of connection fell out of favor because of weight and windage but are still considered one of the strongest connections available. Many supension bridges use this type. More modern connections use poured resin in place of zinc. I'm open to recommendations.