Here provide clear, step-by-step instructions covering safety precautions, disassembly, cleaning, replacement, and reassembly. The user specified "44.6mm" which matches the conical burr size found in many Breville grinders



While specific steps can vary slightly by model (e.g., Barista Express, Pro, Dual Boiler), the process for replacing the 44.6mm conical burr set (the upper and lower burrs) is generally the same for most Breville espresso machines.



Important: Before starting, unplug the machine. You will likely need a flathead screwdriver, a Phillips head screwdriver, and a 9mm or 10mm wrench (or socket).