taper lock joints are common methods to connect multiple power train components such as sheaves and pulleys but are intended to provide torque transmission only keyless bushings are similar devices but cannot be used in a linear actuator the current disclosure is capable of torque transmission axial load retention radial accuracy control as well as the benefits associated with a more flexible connection interface as shown in fig3 a 3d the present actuator system includes a motor 30 a compression fitting 10 and a screw 20 motor 30 defines a hollow shaft 31 there through hollow shaft 31 is open at both ends of motor 30 compression fitting 10 defines a hollow core 16 there through hollow core 16 is open at both ends of fitting 10 in operation compression fitting 10 is positioned in hollow shaft 31 of motor 30 screw 20 is positioned in hollow bore 16 of compression fitting 10 as screw 20 is inserted further into compression fitting 10 compression fitting 10 expands creating an outward radial force within hollow shaft 31 which engages compression fitting 10 with motor 30 the hollow shaft 31 inner diameter and compression fitting 10 outer diameter are matched to a minimal slip fit condition the inner diameter of hollow shaft 31 may be a standard through hole tolerance with a machined surface finish the compression fitting 10 outer diameter is preferably machine finished so that the interface enables increased friction and higher.