A plurality of stacked magnetic cores have a pair of wires threaded through axially aligned openings of the cores. The free ends of the wires are secured to a comb-like, plastic support stick which is formed with a plurality of nests for receiving and supporting individual cores. The cores are fed successively into the nests of the support stick. As the stick is rocked about its longitudinal axis and also indexed longitudinally, the wires are fed through and between successive slots in the stick adjacent to the nests so that each core is supported on the stick and wired thereby. During the wiring of the cores with the stick, each core is clamped within its nest until the wires secure the core with the stick.