Black hub for the large 100mm rear wheel SKU NUM227640 for the Numatic Henry and the Numatic Junior and the Numatic Hetty and the very versatile Numatic George and the "wet" Charles by Numatic and most of Henry's commercial family!! They hold the wheel on the moulded stub axle and are secured with a simple screw.
It's the "top hat" shaped part in the foreground.
The later machines are finished off with a matching coloured hub-cap
At the moment, standard postage is capped at a maximum of $25 within Australia, so maximise the saving on postage and buy something in the related parts below!