Question
I have a sprinkler that has ceased to oscillate.  There are two small adjustment screws embedded in the sprinkler head.  One of them adjusts the height of the spray.  I am not sure what the other does and I have not been able to move it.  Is that the problem and if not, how do I adjust the sprikler?

Answer
The other adjustment hole is the arc adjustment. Depending on what type of sprinkler you have will determine how to adjust it.
Since the sprinkler isn't turning anyway, it will need to be replaced. Usually, once they stop you aren't going to get them to run reliably again.

Matt