The present invention facilitates keeping the slot cells 8 of a generator rotor from migrating during operation of the rotor. The present invention utilizes a slot cell catch 10 that hold slot cells 8, both U-shaped and L-shaped, in position within a rotor body slot 6. The catch 10 limits movement to a pre-determined amount, usually only a fraction of an inch. The catch can withstand the forces of rotor in operation, and the limitation in migration reduces the need for inspection on the slot cells 8 as well as lowering the risk of grounds being created between the windings and the rotor body
