I have always adjusted the sprinklers when they are running, not sure how to do otherwise. You should be able to simply grab the pice that pops up and turn to the correct direction. Also, if you decide to replace the entire unit, make sure you install the bleeder top first, run the system for a minute or 2, then install the regular spray head. This will flush the sand and dirt that will get into the water line when you are changing the unit.
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Pennsylvania, for 60+ years, most recently, Allentown, now TV. 
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