Take apart a micro servo, and remove the gear stop.
Also remove the pot and the circuit board, reassemble the servo, and
wire the motor directly to your power source.
Use a thin wire to connect the servo to your rotating radar head.
http://video.google.com/videoplay?do...G1Bw&q=sdm+tug

You can see the wire connection at the pilot house just below the radar.

If you find a servo isn't working for you, these gear motors are also available.
http://www.gizmoszone.com/shopping/storepro5/agora.cgi