Adjusting a Toro Sprinkler

I have two Toro sprinklers off our garden tank that I originally set to rotate 270 degrees. I have moved them and now want to adjust to spray only 180 degrees. Problem is, I no longer have the instructions. They don't have any adjusting screw for the rotation. From memory the adjustment involved something like positioning one end of the rotation, running the sprinkler to the desired other position, then manually turning it back to the start position. Some sort of "magic" mechanism inside then set the stop. I have tried every combination of this approach that I can think of without success. I can't find anything on the internet and Toro can't help as they can't identify the sprinkler from photos that I sent them. Duh!!

Anyone have any clues?


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