Abstract: A magneto rotor includes a bowl-like aluminum body with an open end defined by an annular rim having an inner peripheral surface. A plurality of arcuate pockets are machined into the peripheral rim surface, each of the pockets extending between first and second radiused ends, the radius of curvature of the pockets being approximately equal to the radius of curvature of the rim. A light weight, high field-strength magnet, formed as an arcuate plate of a neodymium-iron alloy, is adhesively fixed in each of the pockets. Each of the magnets substantially conforms to the pocket in which it is seated, and extends between first and second radiused ends. The engagement between the radiused pocket ends and the radiused magnet ends restrains the magnets from dropping radially inwardly from the pockets should the adhesive fail. The magnets are restrained from moving axially out of the pockets by a retaining ring that covers the open tops of the pockets.