Abstract: An amplifying linkage for rotational actuation between a driving shaft and a driven shaft wherein the driving shaft rotates through a first rotary angle and the driven shaft rotates through a second and different rotary angle. The driven shaft is provided with a first lever arm having a slot formed in its distal end, and the driving shaft is provided with a second lever arm having a pin protruding in a direction parallel to the axis of the driven shaft. The shafts are offset such that the pin is receivable and slidable in the slot. Rotation of the driving shaft through a first angle causes the driven shaft to be rotated through a second angle. The first lever arm is shorter than the second lever arm, so that the second angle is always greater than the first (angular rotation is amplified). The invention is particularly useful in adapting a four-pole torque motor to the actuation of an Electric Throttle Control throttle valve for an internal combustion engine.