I have quite a few customers who have Hunter PS spray heads in their lawns... I like the heads for several reasons, (inexpensive from my irrig place, easy to adjust, easy to replace.. etc) but one thing Ive noticed is that they they tend to turn themselves off. Its usually the full circle heads that do it. Ill go to a job and find a spot thats dry looking and sure enough the head has rotated itself completely around so that its off. Any way of fixing this short of changing all the heads? I hate having a bunch of different heads in a lawn. Ive almost thought of trying a drop of crazy glue..