A position retention device includes a pivot member having a mounting axle, a cylindrical seat, a cylindrical housing and an annular member. The systems and methods track add-on instruction calls and provide a user with call and data context, wherein the user can select a particular add-on instruction context from a plurality of contexts in order to observe values andor edit parameters associated with the add-on instruction. The buffer metal halide includes a halide selected from halides of Ta, Th, Cu, Rb, Nb and Pd. The sleeve has an interior space that permits the oil control valve to be accommodated therein and oil holes.