This noose is attached to a spring which will jerk the noose upwards when triggered, capturing and killing the mouse.

The trigger mechanism is a simple one. A piece of string is inserted through two pairs of corresponding holes, one pair at the top and the other in the base. The string is passed over the spring and tied tight – holding the spring down and the noose in place. The twin strands of the string pass through the tunnel top to bottom, effectively blocking it but allowing sight and smell of the bait.