this is what I think so far if someone is reading this thread and made the same mistake.
When modifying the servo using the superglue method this is what I would do.
While sending a command to the servo to go to 90 degrees (center) I would adjust the pot until the gears would stop moving. You can hear the servo stay still and twitching a bit every 5-10 seconds which is okay.
DONT cut the pot yet or use superglue. these steps are irreversible so follow the next step first
After you made sure that the gears are not moving put the gears on the side with the gears facing up(make sure the gears are not moving) . Then Issue a command to the servo to make sure that It can either move forward , neutral and backwards to make sure that it can move to those directions.
Then, issue a command to the servo again like this if using arduino:
Servo myservo; // create servo object to control a servo
// a maximum of eight servo objects can be created
myservo.attach(9); // attaches the servo on pin 9 to the servo object
myservo.write(90); //tell servo to go 90 degree
//left empty intentionally
then while the gears are spinning adjust the pot if it is moving (which shouldn't move since you already adjusted the pot, if it does adjust it )
While the servo is still connected to the microcontroller, snip off the pot. If the gears begins to move a little bit , use a twizzer or something smaller so you can adjust the pot (only if the gears are moving again when you snip the pot off)
THEN after you made sure that everything is NOT moving , apply superglue to the pot, wait at least an hour just to make sure its all dry. The super glue will be very very strong. If you made a mistake you wont be able to reverse it (melting it won't do , it will only damage the plastic)
THEN reassemble the gears and cover the servo. [ This steps is for those who made a mistake,like me]
NOW if you make a mistake ( I wish you didn't, there is another way to fix it, say if you can only move forward).
The HS-311's circuit board cannot be pry due to the fact that a hot glue was put in place to make sure you cannot take it off.
We need to get the three wires inside the servo and reconnect them using a (2) 1K ohm resistors.
see this youtube video How To Hack A Servo
only follow the way he connected the resistors, you wont be able to follow his steps when removing the circuit board as HS-311 cannot be pry . DONT do it, you will bread the circuit board.
to get the wires inside , you need to drill a hole on the side (where the servo wires at) then use a a twizzer to pull the three wires, then cut the wires and solder the resistors to the wires.
Your servo will look funny, but you just save it.
Hope this helps. thanks to the people that helped me.