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This is modifying the Futaba S3001 servo.  This shows what needs to be done to the servo stops.  The servo pot is glued when the center is found instead of the resistor method that other sites show.

Either remove the inside pot slot for the output gear.  You may need to drill this out on some servos.  Use Method Number 1 for easiest adjustment. If the slot cannot be removed, snip off the pot shaft as shown below in Method Number 2 or use the resistor method other sites show to take the place of the pot.

Modify the Output Gear by removing the limit stop piece

Remove the stops on the inside of the servo case.  This is done just in case the output gear stop wasn't removed cleanly. Fit the output gear back in and make that it turns freely.

Easiest Method Number 1 for adjusting the pot.

Use Super glue around the pot shaft and let it dry. NOTE: Do not get glue on the brass bushing, the ouput gear sits on this.

Adjust the pot shaft with the Transmitter's sticks centered and the trim tabs centered also until the servo motor stops.

Here is the servo with its pot adjusted and the glue dried. Re-assemble the servo at this state tempory with the output gear to make sure everything moves freely without any catching.  If it seems okay, then add the other gear/gears.  You should be good to go. If the servo moves slowly afterwards, use the transmitter trim tabs to nullify the movement.

Method Number 2.

If you decided not to or could not remove the output gear pot slot.  I like to just snip the pot shaft off the pot. Connect the servo electronics to the receiver and with the transmitter sticks in the center.  Adjust the servo pot until the servo motor stops running.  Move the transmitter stick and the servo motor should start running again.  Re-center the transmitter stick and the servo motor should stop again.   Use Super glue at the pot shaft and the pot itself and let the gue dry before re-assembling.

MAKE sure the output gear turns freely by inserting the output gear back into the servo case and turning the gear. Also make sure the pot fits into the output gear and the gear can still move freely without affecting the pot.