An actuator for a ram air turbine system comprising: a piston rod that is cylindrical in shape and centered about a centerline; a plurality of stow lock pawls supported by the piston rod and able to move radially, each of the plurality of stow lock pawls having a frusto-conical crown with a crown radius, the crown radius extending from a crown datum point on the frusto-conical crown to a crown axis; a lock bolt extending along the centerline radially within the piston rod, the lock bolt configured to be axially movable within the piston rod between a stowed position and a deployed position; a plurality of rollers radially outward from the centerline configured to be guided by the lock bolt; and a cylinder having a frusto-conical mating surface with a mating radius, the mating radius extending from a mating datum point on the frusto-conical mating surface to the centerline, the cylinder being positioned radially outward from the piston rod and configured to be axially movable between the stowed position and the deployed position, a datum axis extending between the crown datum point on the frusto-conical crown and the mating datum point on the frusto-conical mating surface; characterised in that: each of the stow lock pawls further comprises an outer surface, an end, a frusto-conical relief and an edge, wherein the frusto-conical crown and frusto-conical relief meet at the edge, and the outer surface of each stow lock pawl is parallel to the crown axis that is parallel to the centerline; a ratio of the crown radius of the plurality of stow lock pawls to the mating radius of the cylinder is less than 0.98 so that the crown axis of the plurality of stow lock pawls is closer to the datum axis than the centerline; and the frusto-conical crown and the frusto-conical mating surface both extend at a first angle (θ 1) and the frusto-conical relief extends at a second angle (θ 2) that is larger than the first angle (θ 1), wherein the first and second angles (θ 1, θ 2) are both measured from a plane that is perpendicular to the centerline and the crown axis and in the same direction. a piston rod that is cylindrical in shape and centered about a centerline; a plurality of stow lock pawls supported by the piston rod and able to move radially, each of the plurality of stow lock pawls having a frusto-conical crown with a crown radius, the crown radius extending from a crown datum point on the frusto-conical crown to a crown axis; a lock bolt extending along the centerline radially within the piston rod, the lock bolt configured to be axially movable within the piston rod between a stowed position and a deployed position; a plurality of rollers radially outward from the centerline configured to be guided by the lock bolt; and a cylinder having a frusto-conical mating surface with a mating radius, the mating radius extending from a mating datum point on the frusto-conical mating surface to the centerline, the cylinder being positioned radially outward from the piston rod and configured to be axially movable between the stowed position and the deployed position, a datum axis extending between the crown datum point on the frusto-conical crown and the mating datum point on the frusto-conical mating surface; characterised in that: each of the stow lock pawls further comprises an outer surface, an end, a frusto-conical relief and an edge, wherein the frusto-conical crown and frusto-conical relief meet at the edge, and the outer surface of each stow lock pawl is parallel to the crown axis that is parallel to the centerline; a ratio of the crown radius of the plurality of stow lock pawls to the mating radius of the cylinder is less than 0.98 so that the crown axis of the plurality of stow lock pawls is closer to the datum axis than the centerline; and the frusto-conical crown and the frusto-conical mating surface both extend at a first angle (θ 1) and the frusto-conical relief extends at a second angle (θ 2) that is larger than the first angle (θ 1), wherein the first and second angles (θ 1, θ 2) are both measured from a plane that is perpendicular to the centerline and the crown axis and in the same direction. each of the stow lock pawls further comprises an outer surface, an end, a frusto-conical relief and an edge, wherein the frusto-conical crown and frusto-conical relief meet at the edge, and the outer surface of each stow lock pawl is parallel to the crown axis that is parallel to the centerline; a ratio of the crown radius of the plurality of stow lock pawls to the mating radius of the cylinder is less than 0.98 so that the crown axis of the plurality of stow lock pawls is closer to the datum axis than the centerline; and the frusto-conical crown and the frusto-conical mating surface both extend at a first angle (θ 1) and the frusto-conical relief extends at a second angle (θ 2) that is larger than the first angle (θ 1), wherein the first and second angles (θ 1, θ 2) are both measured from a plane that is perpendicular to the centerline and the crown axis and in the same direction.