Servo-wheel for use with powered model craft

For use in a control system for a model craft having a servo-motor and movable control members, a servo-wheel comprising:

• a rigid disc-shaped body having first and second opposed planar surfaces and an outer circumferential surface;
• a hub at the geometric center of the body, the hub including a through-bore formed therein extending from the first planar surface to the second planar surface, the through-bore having only a first part and a second part, the first part having a first diameter and being a keyed receiver, the second part having a second diameter greater than the first diameter and being a receiver adapted to receive a disc-shaped insert;
• a disc-shaped insert mounted in the second part of the bore, the insert being a flat disc having the same diameter and axial depth as the second part of the bore;
• the insert including an aperture formed therethrough, the aperture being coaxial with the first part of the bore;
• a keyed driver received at a first end by the keyed receiver, the keyed driver rotatably connected to the servo-motor at a second end, whereby the servo-wheel is rotatably moved by the servo-motor;
• and
• means interconnecting the servo-wheel and the control members for transmitting the movement of the servo-wheel to the control members.