here is a head that was replaced by a "professional" contractor on a lawn that I mow. There are about 6 heads just like this along with 3 new valve boxes. I told the HO to call them back to correct them. The way they corrected them was they threw a shovel full of dirt around each one!
We have already had an understanding of its not a question IF they get hit with the mower, but when and that I will not be responsible for it!!