I have the pulley system working perfectly. However I need to attach an object to the actual belt so it will travel back and forth with the belt. The system rotates the drive pulley/belt CW for a short period of time then reverses direction CCW for the same short period of time, and repeates. I really need help with how I should constrain this object to the belt, using mates or if it needs to be included with the belt sketch when selecting pulleys to go around. thanks!