Abstract: A gear box may have a housing and a driving shaft with a gear and a driven shaft with a gear. The shafts may be rotatably mounted in the housing and positioned so that the driving shaft gear meshes, i.e., is in operable position, with the driven shaft gear. An eccentric bearing adjust may be positioned to surround a part of the driving shaft (or a part of the driven shaft). A first and second tip set screws may be positioned in the housing in operable position to the eccentric bearing adjust. The first and second tip set screws are configured to rotate the eccentric bearing which moves a center position of the driving shaft (or a center position of the driven shaft) when the screws are tightened or loosened. Rotating and calibrating the eccentric bearing adjust mitigates any backlash between the driving shaft gear and the driven shaft gear.