If any one has any advice please let me know. I just got a ROB and it will go left right and open close but not up and down. I felt adventurous so i opened him up and commenced with surgery. All of the gears fell out and what looked like a sensor that rides along the center column to tell when he has moved one notch. Now after hours of messing around inside i finally got him back together but he still will not go up and down. It sounds like when he is trying to go up and down there is a gear that is clattering around inside. Im pretty sure i got everything back together right. I dont know what i am doing wrong. Maybe i have the motors on the wrong sides. If anyone has any pics or tips on the correct configuration it would be greatly appriciated. Thanks.