For my classses, I have a box full of continuous rotation servos that need to be re-centered, but the internal "screw" is worn. If the case is opened, I can adjust the resistance with the flathead end of the supplied screwdriver (or needle-nose pliers), and get the motor close enough to being centered. For this, the motor is attached to the Basic Stamp outside its black plastic housing. I have done this once; it seemed to work
Is this process essentially mechanical, or will I tamper with electrical circuits I don't understand. Otherwise, the only thing I can do is what, throw out the 20 or so motors?