***Obviously the shells/cartridges have been used. Never cut into or heat live ammunition.
For the key rings Eamon used some off cuts of wood to create a dowel that would fit into end of the shell. I used a block plane and sand paper for this. I used a hot iron to separate the plastic and the metal of the shell. The wood is stained in a walnut stain and finished in lacquer which is not shown in the video. The wood is attached to the shell part with gorilla super glue.
Always be safe and careful when using tools and machinery!!
Source: Eamon Walsh DIY