A hydraulic power source comprising: a valve body defining a first spool bore and a second spool bore; a first spool disposed in the first spool bore and a second spool disposed in the second spool bore; an actuator for alternatingly moving the spools (10, 10')in a first direction and a second direction that is opposite of the first direction so that when one spool moves in the first direction, the other spool moves in the second direction; and a manual override assembly for overriding the actuator, the manual override assembly including a lever arm pivotally movable relative to the valve body about a pivot axis, the manual override assembly also including a first connecting rod for connecting the lever arm to the first spool and a second connecting rod for connecting the lever arm to the second spool, the first and second connecting rods (30, 30') each including a spool engagement flange (31, 31'), the first and second connecting rods (30, 30') being connected to the lever arm on opposite sides of the pivot axis, wherein when the lever arm is pivoted about the pivot axis in a clockwise direction the first connecting rod is moved in the first direction and the second connecting rod is moved in the second direction, and when the lever is pivoted in a counterclockwise direction the first connecting rod is moved in the second direction and the second connecting rod is moved in the first direction; characterized by: the first and second spools (10, 10') each including connecting rod bores (12, 12') for respectively receiving the first and second connecting rods (30, 30'), the first and second spools (10, 10') also including axial end faces that define bore access openings for providing access to the connecting rod bores (12, 12'), the bore access openings each including a first region and a second region laterally offset from the first region, the first regions being sized and shaped to allow insertion of the spool engagement flanges (31, 31') of the connecting rods (30, 30') therethrough, the second regions being sized and shaped to prevent the spool engagement flanges (31, 31') from passing therethrough, wherein the first and second connecting rods (30, 30') are constructed to be loaded into their respective connecting rod bores (12, 12') and thereby coupled with their corresponding first and second spools (10, 10') by inserting the spool engagement flanges (31, 31') through the first regions of the bore access openings and then sliding the connecting rods (30, 30') laterally into alignment with the second regions (122, 122') of the bore access openings such that the spool engagement flanges (31, 31') are captured within the connecting rod bores (12, 12'). a valve body defining a first spool bore and a second spool bore; a first spool disposed in the first spool bore and a second spool disposed in the second spool bore; an actuator for alternatingly moving the spools (10, 10')in a first direction and a second direction that is opposite of the first direction so that when one spool moves in the first direction, the other spool moves in the second direction; and a manual override assembly for overriding the actuator, the manual override assembly including a lever arm pivotally movable relative to the valve body about a pivot axis, the manual override assembly also including a first connecting rod for connecting the lever arm to the first spool and a second connecting rod for connecting the lever arm to the second spool, the first and second connecting rods (30, 30') each including a spool engagement flange (31, 31'), the first and second connecting rods (30, 30') being connected to the lever arm on opposite sides of the pivot axis, wherein when the lever arm is pivoted about the pivot axis in a clockwise direction the first connecting rod is moved in the first direction and the second connecting rod is moved in the second direction, and when the lever is pivoted in a counterclockwise direction the first connecting rod is moved in the second direction and the second connecting rod is moved in the first direction; characterized by: the first and second spools (10, 10') each including connecting rod bores (12, 12') for respectively receiving the first and second connecting rods (30, 30'), the first and second spools (10, 10') also including axial end faces that define bore access openings for providing access to the connecting rod bores (12, 12'), the bore access openings each including a first region and a second region laterally offset from the first region, the first regions being sized and shaped to allow insertion of the spool engagement flanges (31, 31') of the connecting rods (30, 30') therethrough, the second regions being sized and shaped to prevent the spool engagement flanges (31, 31') from passing therethrough, wherein the first and second connecting rods (30, 30') are constructed to be loaded into their respective connecting rod bores (12, 12') and thereby coupled with their corresponding first and second spools (10, 10') by inserting the spool engagement flanges (31, 31') through the first regions of the bore access openings and then sliding the connecting rods (30, 30') laterally into alignment with the second regions (122, 122') of the bore access openings such that the spool engagement flanges (31, 31') are captured within the connecting rod bores (12, 12').