What size diamond disc does the Masonry 750 Plus take, and how do I change it?

The Masonry 750 Plus uses a disc with a 750 mm (30 in) outside diameter, a 25.4 mm center hole and a maximum thickness of 4 mm. A 700 mm disc can also be fitted, but the cutting head stroke must be recalibrated first, which IMER says should be done by skilled people. To change a disc, unplug the saw, remove the water pipe, undo the three guard screws, and loosen the left-hand-thread lock nut by turning it clockwise. Do not use damaged discs or ones with missing segments, never use wooden discs, and match the rotation arrow on the guard. Only use discs rated for the rpm on the data plate.