1. 1.Unscrew the erroneous cutting head from the cutting body. Also unscrew the nozzle nut so that you can take off the nozzle.It looks like the picture shown below.
2. 2.Take a new cutting head purchased from A&V Waterjet.
3. 3.Put the nozzle back before screw it back to the cutting body.
4. You are ready to go.