The idea of this key is to wrap some aluminium tape around fingertips and then tap them on a veroboard surface to create morse code.
Veroboard strips are cut so that short circuiting any neighboring strips with conducting fingertips makes a contact between keying cables. (Click the foto to enlarge it and see the cuts better.)
Keying board was glued to a wooden base and the key is ready. One, two or more fingers may be used.
See & hear a video clip:
