Wall Following with Constrained Active Contours

A motor-nozzle coupling member for coupling a motor to a nozzle in an electro-hydraulic control structure wherein a linear electric motor having an armature is located at a fixed distance relative to the nozzle by a coupler which engages the motor and nozzle and extends therebetween to establish the spacing between the motor and nozzle and with the coupler being deformable after initial assembly to set the desired spacing.