Abstract: A method of providing a torque motor with air gaps of equal length between an armature interposed between two spaced polepieces, comprises the steps of: assembling the torque motor so that the armature is roughly positioned between the polepieces, positioning an electrode so that two spaced portions thereof of equal width are arranged proximate the air gaps, providing a plurality of repetitious pulses of electrical energy between the electrode and the torque motor assembly, moving the electrode and torque motor assembly relative to one another, and removing proximate material from the armature and polepieces, as necessary, by electrical discharge between the electrode and torque motor assembly, thereby to provide air gaps of equal length between the armature and the polepieces.