hey, im confused about the servo's, if the pot head is the big plastic bit that moves all the gears round, why superglue it? because then wouldnt the whole thing not be able to move and be completely pointless??
Open your servo and you will find lots of gears. One of them has a slot on the bottom and sits on a potentiometer. This makes up the encoder. The servo knows where it currently is due to the pot position. So it starts to move the motor via the gears - including the gear that sits on the pot. So now the servo has a new 'actual' position of the servo.
The pot gives 'current position' but is changed as the gears move to help home in on the required position.
When you modify the servo you 'dremmel' out the slot so that the gear moves without changing the pot. And it is the pot that is superglued in place to stop it moving. Having done this then when you tell the servo to go 'slightly' clockwise it says ok 'thats a smalll movement' so I will start turning the motor until the pot says I've got there. But since the pot is glued in place it doesn't move so the servo keeps thinking 'thats a small movement' so the output shaft keeps moving clockwise. If you telll it to make a large movement (eg full clockwise) then it says 'hey - a big movement' so it moves the motor quickly. But since the glued pot says nothing has changed then it keeps saying this so the shaft continues to move quickly
You aren't glueing the gears, you are only glueing the pot, to make the servo think it has never got to the correct place so that it keeps turning.