Hesiod advised the farmer to always have two ards handy, so that if one broke the other could replace it.
The second was the sole-ard, called pekton (πηκτον, "fixed"), because in it three parts (stilt + sole (Gk gyes) + beam), which were of three kinds of timber, were adjusted to one another and fastened together by nails.
The autoguos crook-ard was made from a sapling with two branches growing from its trunk in opposite directions.
In ploughing, the trunk served as the draft-beam, one of the two branches stood upwards and became the stilt, and the other scratched the ground and, sometimes shod with bronze or iron, acted as the share (Gk hynis; L vomer).
Based on an article from A Dictionary of Greek and Roman Antiquities, John Murray, London, 1875. ἄρατρον