a plurality of vertical threaded bores within the actuator housing bolts may pass through the plurality of vertical bores and be threaded into the vertical threaded bores within the actuator housing in other embodiments the top plug is affixed to the actuator housing by horizontal bolts in such embodiments the top plug may fit within the inner wall of the actuator housing the top plug may possess a plurality of horizontal threaded bores likewise the actuator housing may possess a plurality of horizontal bores so that the bolts may be inserted through the horizontal bores and be threaded into the horizontal threaded bores preferably in such embodiments distal or proximal to the horizontal threaded bores may be one or more grooves adapted to receive a seal such as an o ring in further embodiments of the invention regardless of the attachment method used to attach the top plug to the actuator housing the top plug may be separated from the distal side of the piston sleeve and thereby form a first hydraulic chamber hydraulic fluid may enter the hydraulic piston chamber via at least one hydraulic fluid port running form the distal side of the piston sleeve to the proximal side of the piston sleeve in this embodiment the number and diameter of the hydraulic fluid port or ports can be optimized to reduce the flow of hydraulic fluid from the first hydraulic chamber to the hydraulic piston chamber in order to prevent slamming of the piston into.