Question
How do I replace or clean the "automatic/manual/off" switch?
My problem is that when in the automatic position, the switch doesn't maintain contact and the watering stops.  If if must be replaced, where can I get the part? How much does it cost? Can I get instructions on how to replace it?
Thanks for your help.  I await your response.

Answer
Hey Leon, they don't make this controller anymore, or the parts for them. You are better off replacing the whole controller. Replace it with either a Irri-trol "Rain Dial" controller or a Rainbird "ESP" series controller. Good luck and have a great day.