Abstract: Rotary actuator lever apparatus having an annular recess are described. An example rotary actuator lever includes a cylindrical body that has a first opening and a second opening axially aligned with the first opening, and sized larger than the first opening. The lever arm extends a predetermined distance from the body and has a first arm member spaced from a second arm member. Each of the first and second arm members includes an aperture to receive a fastener to operatively couple the lever to a stem of an actuator. The body includes an annular recess adjacent the first arm member of the lever arm to enable the first arm member to flex relative to the second arm member when the lever couples to the actuator stem.

Abstract: Collets for coupling rotary actuators to valves are disclosed. An example collet includes a first plurality of flexible members configured to be coupled to an elongated member and each having a first inner surface and a first outer surface. The first inner surface and the first outer surface define a first cross-sectional shape. The example collet further includes a second plurality of flexible members configured to be coupled to the elongated member and each having a second inner surface and a second outer surface. The second inner surface and the second outer surface define a second cross-sectional shape that is different from the first cross-sectional shape of the first plurality of flexible members.