Please explain how to uninstall a Toro 700 Sprinkler head. It is cracked on one side and does not pull up.?

There are arrows to twist it one way to remove but it sticks. Should I pry it open with a screw driver? I am not finding Toro 700 replacement parts but I ume any single stream Toro product will do. How do I make it stay fixed in a certain direction? Right now it waters my neighbors yard, thanks!