If I remember correctly, on the 800 series, twist the sprinkler head to establish the left swing.
Grab an old toothbrush, your bifocals or reading glasses, and a flathead screwdriver.
Use the flathead adjustment screw on the top of the sprinkler head to establish the limits of your right swing. There are markings to provide clues if you can read injection molded black in black numbering.
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