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.