Terminal pins are mounted with a force fit into holes in a circuit board. The circuit board is placed over a backing plate having holes aligned with the circuit board holes and of large enough cross section freely to receive a terminal pin. A loading plate is placed over the circuit board and has holes each sized slidingly to receive a single terminal pin. A feeding plate having a thickness at least approximately equal to the terminal pin length is placed over the loading plate, and the feeding plate has holes of a diameter larger than about one-third of the terminal pin length. A number of terminal pins are placed on the upper surface of the feeding plate, and the feeding plate, loading plate, circuit board and backing plate are all vibrated. During the vibration a group of terminal pins are loaded into each feeding plate hole, and a single terminal pin is loaded into each loading plate hole. The feeding plate is removed from the loading plate and the excess pins are removed leaving a single terminal pin in each loading plate hole. The terminal pins are then pressed through the loading plate into the circuit board.