The trigger guard pivots down for stripping and detents in position through a spring-loaded plunger. Magnetic detents are most often used to divide a shaft rotation into discrete increments. An over-torque condition pushes the balls out of their detents, thereby decoupling the shaft. Stepper motors rely on magnetic detents to retain step location when winding power is removed. Magnetic detents are inherent in some types of electric motors, most often stepper motors. VR motors do not have power off detents.