Are you a lefty or righty??? On adjustable rotors the different manufacturers will have the "permanent arc side" on either the left or right side. This side usually has to be adjusted by turning the whole body in order to line up this side. Then we adjust the opposite arc side to either open up or close down. Which do you prefer? My personal choice is to have the right side as the permanent side. When the sprinkler is inserted into the body and screwed in right there is no chance for the right side setting to move. I then leave the right side arc just short of the intended target and turn the body as needed to make it spot on. Makes it a lot easier for me to have the right side permanent and short of the target line because when I use Channel Locks on the body the sprinkler won't loosen from the body if I happen to get the cap instead of the body while adjusting. Also seems to make it easier if I've had to break down the throw a little so I can compensate for fanning effect. I then adjust the left side. I'm sure it's going to boil down to what primary sprinklers everyone uses and the more one adjusts these sprinklers the more the comfort zone is. And, then of course, there are those sprinkler models out there where you just slap the thing in and then can adjust BOTH arc sides.