Abstract: A method for manually assembling an inductor and calibrating it, and apparatus to facilitate practice of the method. Laminations are manually inserted into the ends of a hollow core of a wire-wound bobbin to build up a right hand stack of laminations and a left hand stack of laminations. Manual insertion of the laminations is facilitated by use of a stacking block which includes upright indexing posts to promote registration of the laminations. The left and right laminations are so stacked that an oversize air gap is included between the right hand stack and the left hand stack. After all the laminations have been stacked, the inductor is placed on a calibrator bed to facilitate calibration. The calibrator bed includes first and second sets of jaws which are closed along orthogonal directions under control of an operator. Closure of the first set of jaws brings the laminations into registration.