Radio Shack Super Armatron Vintage Toy Robotic Arm Partially Working

This is a vintage Radio Shack Super Armatron. When I first put batteries into it nothing would work. When I picked it up and tilted it forward and backwards and side to side the motor mysteriously started running. It must have a loose electrical connections or the batteries are not making a good connection. The arm will move side to side and up and down but I could never get the claw to do anything. It is clean and does not have scuffs or scratches which makes me think it was not played with very much. It requires 2 D cell batteries which are not included. The original box is included and is badly tattered.
The pictures show the actual item you will receive.