Abstract: A servo motor assembly having a cylindrical motor casing with connector terminals extending axially from one end and a driving shaft from the opposite end. An annular slotted ring has the connector terminals received therethrough and the ring is axially pressed into a housing having a connector receptacle for connection to a power source. The ring has projections on the outer periphery to frictionally retain the motor and ring in the housing and compress the ring to frictionally engage the motor casing and absorb any inertial reaction torque therebetween. Electrical leads are connected from the motor terminals to the receptacle on the housing.