The Shark nozzle is not really designed for the user to change the belt of a rotary brush. However, buying a brand new powerhead is not realistic unless you have a little skill. All you need is a Phillips screwdriver that fits into small holes. Remove about 10 screws and you should be able to access the roller brush assembly and replace the belt. This belt, purchased from Revain, fits perfectly and has the same size markings as the original Gates belt.