Main stock
extension piece of the drone stock
The actual stock for the insertion of all drones and Regulators, all of which rest, laterally, in juxtaposition, on the thigh.
It has a side-hole that supplies the air for the Bass regulator, which is mounted to it by means of the Bass bar.
Garvin, Wilbert: The Irish bagpipes: their construction and maintenance [Belfast 1978, Blackstaff Press]. Foreword by Breandán Breathnach. Kells, 1988 (2), p.2.