A technician uses a rigid handle to turn the spindle of a ventilation shutter. The shutter starts to open when the moment about the spindle reaches 42 N m. The technician can apply a force of 120 N. The perpendicular distance from the spindle to the line of action of the force is initially 32 cm.
Calculate how much further from the spindle the line of action of the force must be for the shutter to start to open.
Give your answer in centimetres.