Instructions
This design is untested:
Print it out and cut some strips of tin or metal about 10mm wide and 14mm long.
I imagine soda can metal would work well but be sure to sand it gently to make sure it will form a contact.
Curve the strips gently around a pencil (not too much because they still have to slide into the 1.4mm wide gaps - the curve should make the strip "grip" as it slides in).
Put the strips into the gaps underneath.
Use a drop of glue to hold the strips in place if needed
Turn over and use :)





