An assembly may have an axle. Rotation of the axle may cause deflection of a portion of a medical device. A collet may have an opening. The axle may extent through the longitudinal opening. An actuator may be configured to interact with the collet. A first configuration of the collet may permit rotation of the axle relative to the collet and a second configuration of the collet may inhibit rotation of the axle relative to the collet.