The springs are sections from a spring from an old wind up clock wich had snapped.

I use toothpicks as arrows.

The wire i used was some I had lying around.

The parts are printed with my HE 3D rerprap prusa I3 3D printer.

I use a little spring to push the pushbutton back to it's original place after its is pushed.

The shaft where the triggers rototate around is made out of a nail.

Everything is glued with two-componend glue.