http://emediadesigns.com/focuser/# this is the main source of what i am using. from what i have read that im not actually using any of the circuitry within the servo motor, im only using the motor for its low speed high torque and the nice black plastic box it sits in.
the motor still only needs power or no power or inversed power (thats where the backwards and forwards motion comes in). when you pull the motor out it will only have a positive and negitive attachment to the PCB.