engages a rotatable output gear spline this combination of gears together with an eccentric and counterweight mounted on the input shaft provides a system having numerous advantages in the field of high ratio mechanical power transmission application_number US 65115376 A description in the embodiment of the present invention as shown in fig1 and 2 there is provided a speed reducing system 10 which includes an input shaft 11 and output shaft 12 mounted in axial alignment the input shaft 11 carries an eccentric 13 which is formed integrally with a counterweight 14 in a plane perpendicular to the axis of the input shaft 11 the center of gravity of the counterweight 14 lies on a line which extends from the input shaft 11 diametrically opposite to a line from the input shaft 11 to the center of gravity of the eccentric 13 thus the moment of the counterweight 14 and of the eccentric 13 are 180 u00b0 out of phase during rotation on the input shaft 11 the counterweight 14 is provided with removable weighted members 36 37 secured to the counterweight 14 by means such as a locking screw 38 the removable feature of members 36 37 allows the amount of weight.