An apparatus for lifting, lowering and positioning well servicing apparatus relative to an oil or gas well is disclosed. A tubular main body is mounted in an operative position relative to a wellbore, by a bolted flange, clamp or other means. A lift arm having a vertical arm section and a horizontal arm section is slidably disposed in said main body and movable vertically and rotationally. A hydraulic cylinder, preferably positioned within the main body, moves the lift arm vertically up and down. Desired rotation is achieved by the interaction of a guide pin or cam follower, disposed in the main body and extending into a slot pattern on the outer surface of the vertical arm section, as the lift arm is moved vertically by the hydraulic cylinder. The apparatus can be used to position a safety “night cap,” a ball drop mechanism, or other tools on a well.