Robot shoots erratically. Some balls delivered high, others low or off to the side. See Figure E . B. Ball Discharge Wheel is dirty, worn, out of round, cracked, or loose. See Figure D .
Motor mounting screws are loose.
The brass shaft on the Ball Speed Motor has come loose. See Solution 4C . E. Slots in Robot Head Housings for Friction Block tabs are worn. See Figure E . Robot shoots more than one ball at a time.