I have not been able to figure out how to adjust the cam on the CVA-24T 180° Actuator. It currently goes slightly past the close position on one of my 3-way Jandy valves and this causes my spa to drain. There is no manual available for this actuator on the Pentair web site. I took off the top 4 screws of the actuator, but I don't see the cam locking nut or the cam in order to adjust the position. Can anyone give me more instruction?