This torch is inspired in the work of Phil B:
I wanted to do something different (sorry, I'm so).
I thought: if two carbon electrodes forms arch, why not try with only one?
Step 1: What is needed
A spring clip, in proportion to the cable.
A piece of wood 1 x 1 inch, to make the handle.
A screw with two washers, a nut and a "butterfly nut"
A carbon electrode. I used that of a D size, 1.5V carbon battery.