In the USA the mowers all have solid blades, because they all have thin cast alloy
flywheels and they must have the blade as the counterweight or they cannot operate properly, as a matter of fact you cannot start an American lawnmower without the blade or the pull handle will rip out of your hand and can do serious damage to both your hand and the mower...

So that brings me to the question do all Australian mowers have cast iron flywheels? or do they just have enough weight with the disc?

Food for thought

Kori laugh