I have had the chance now to use the Nut Harvester, it works a charm! It manages to pick up the big nuts, as well as the partly eaten ones left by the Black Cockatoos.
I have nearly collected an entire garbage bin full of gum nuts. The great thing about the Nut Harvester, compared to raking, is that the smaller parts of the nuts, twigs and other vegetation get left behind. So this great for my yard, getting extra nutrition into the soil.
I am very impressed by it!
— Murray Rye