A spring seat configuration for use with a pneumatic actuator, the configuration comprising: an adjusting screw (124, 400) having an end (304, 408); a spring seat having a cylindrically- shaped body, the body comprising: a shoulder to receive an end of a coil spring; a boss projecting away from the shoulder toward a first surface of the body, wherein the boss is centrally disposed on the body and sized to fit within an inner diameter of the coil spring; and an aperture in a second surface of the body opposite the first surface, wherein the aperture is configured to receive the end of the adjusting screw such that a wall of the aperture engages the adjusting screw to substantially fix a longitudinal axis of the body relative to a longitudinal axis of the adjusting screw and a longitudinal axis of the spring, wherein the aperture comprises a lead-in surface to facilitate passage of the adjusting screw into the aperture, and characterized in that, the wall of the aperture is either: (a) threaded to threadably engage the threaded end of the adjusting screw, or (b) dimensioned to form an interference fit with the end of the adjusting screw, such that the wall of the aperture engages the adjusting screw to substantially reduce tilting of the body or buckling of the coil spring. an adjusting screw (124, 400) having an end (304, 408); a spring seat having a cylindrically- shaped body, the body comprising: a shoulder to receive an end of a coil spring; a boss projecting away from the shoulder toward a first surface of the body, wherein the boss is centrally disposed on the body and sized to fit within an inner diameter of the coil spring; and an aperture in a second surface of the body opposite the first surface, wherein the aperture is configured to receive the end of the adjusting screw such that a wall of the aperture engages the adjusting screw to substantially fix a longitudinal axis of the body relative to a longitudinal axis of the adjusting screw and a longitudinal axis of the spring, wherein the aperture comprises a lead-in surface to facilitate passage of the adjusting screw into the aperture, and characterized in that, the wall of the aperture is either: (a) threaded to threadably engage the threaded end of the adjusting screw, or (b) dimensioned to form an interference fit with the end of the adjusting screw, such that the wall of the aperture engages the adjusting screw to substantially reduce tilting of the body or buckling of the coil spring. a shoulder to receive an end of a coil spring; a boss projecting away from the shoulder toward a first surface of the body, wherein the boss is centrally disposed on the body and sized to fit within an inner diameter of the coil spring; and an aperture in a second surface of the body opposite the first surface, wherein the aperture is configured to receive the end of the adjusting screw such that a wall of the aperture engages the adjusting screw to substantially fix a longitudinal axis of the body relative to a longitudinal axis of the adjusting screw and a longitudinal axis of the spring, wherein the aperture comprises a lead-in surface to facilitate passage of the adjusting screw into the aperture, and characterized in that, the wall of the aperture is either: (a) threaded to threadably engage the threaded end of the adjusting screw, or (b) dimensioned to form an interference fit with the end of the adjusting screw, such that the wall of the aperture engages the adjusting screw to substantially reduce tilting of the body or buckling of the coil spring.