I'm trying to figure out if it is possible to modify a JX Servo PDI-6208MG 8KG Servo 120 Degree 0.07 sec, which matches the required speed, size, and torque, but make it rotate over 270°. I'm using an Arduino Uno with a PWM library, and have to set 12 fixed positions exactly in the 270° rotation range.
One example describes using 2 kΩ, 1/8 W resistors and making the servo rotate almost 360°.
The answer to turning positional servo motor more than 180 degrees describes using microseconds.
Also, I've found some gear modification methods, but I don't know if that is possible with this motor.
And 359 Degree Servo Modification.
The rotation with box manually is 190°, and without the box is 220° because of the pin on the gear contacts with limits on the box. Limitation on 220° from inside, looks like a potentiometer: