These GWS S03N standard servos are a common, useful servo that is also very receptive to being converted to gear motors by removing their internal drive circuitry.

• Futaba spline
• Bearings: Bushing
• Gears: Nylon
• 60° speed: .23 sec @ 4.8v
• 60° speed: .18 sec @ 6.0v
• Torque: 47.00 oz*in (3.38 kg*cm) @ 4.8v
• Torque: 56.00 oz*in (4.03 kg*cm) @ 6.0v
• Measurements: 1.56 x1.14×1.40 inches (39.6 x 29.0 x 35.6mm)
• Mass: 1.45 ounces (41.1g)