Hi! I have Hunter I-20 sprinklers in my lawn. I wanted to adjust the distance of throw of some of the sprinklers as we are planning on putting a playhouse in the back. I was able to adjust the distance for one of the I-20 sprinklers using the wrench key, but the wrench key does not completely go in the radius adjustment screw in another sprinkler for me to set it. Why is that? What can I do to fix it? Any help would be greatly appreciated. Thanks.
Get a squirt gun or shampoo bottle full of water and blast the debris out of the allen screw adjustment hole.