Top rope self belay with shunt on static abseil line with DMM belay screw gate - After a fall the shunt became jammed on the rope, it would not open or allow the rope to move. The weight had t be transferred onto a Gri Gri and Jumar. After jumaring to the top, threading the bolted belay, and pulling up the other end of the rope, it was possible to return safely to the ground. Only when returning home could the shunt be removed with a hammer, and it appeared the shunts lever had twisted to the side.