Now you can make a matching set.
Step 1: Mark The Center
Step 2: Clamp And Drill
Step 3: Hammer
As you hammer rotate the mandrel and apply slight pressure towards the anvil. The ring will form a cone shape. Continue to hammer until the cone forms a cylindrical ring.
Once you have the ring shape you can continue to hammer causing the ring to expand in diameter. This is where you check it against the finger measurement it's being made for.
Important. As yor move the ring up the mandrel, flip it around. This helps to make the cone a cylinder.
Step 4: Mount The Ring
After you press the ring on the socket, use a nut and bolt and secure it through the female end. The protruding end of the bolt will be used for mounting in the drill press.
Place a smaller coin under the socket while you tap the ring on. This leaves an even spacing to true the edges up.
Mount the assembly in the drill press and spin it round. You will shape the bottom side first.