end face surface of annular collar 72 for rotatably supporting the annular face surface 82 in a press fitted relation actuator arm 26 has a u201c l u201d shaped configuration formed by a right angled end portion 26 a having an enlarged torque receiving connector 26 b pass through a hollow interior of the body of mounting stud 74 and through a slotted throat 26 c extending interiorly of projecting wall 56 establishing a torque transmitting relation between handle portion 50 and actuator arm 26 in fig8 a the actuator assembly is shown in a stand by or ready position and as such flush control member 70 rests against face surface 58 a spring 64 provides a resilient biased force applied by piston 66 for resistance by stop 60 and applied by spacer 62 for resistence by wall 58 to discharge a minimum amount of water from the flush tank as shown in fig8 b handle 51 is rotated through an angle u03b1 which moves the piston 66 into engagement with flush control member 70 without compressing spring 64 whereby the piston remains resiliently positioned against stop 60 the rotation of handle 50 is sufficient to displace the end of actuator rod 26 upwardly and.