An easier way to replace a defective sprinkler is to just buy a new one, turn the top of the new one to pull out the guts of the system and do the same to the old sprinkler in the ground. Take new guts and put it in the old housing in the lawn. This method allows one to change the workings, while not screwing out the entire sprinkler. No digging involved. Takes about 60 seconds to change a head.
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