Arblaster then stood for .
Arblaster then was elected to the seat of Mosman at a July 1972 by - election caused by the mid-term retirement of former Liberal Leader and Minister of the Crown , Pat Morton .
Arblaster then stood for and was elected to the seat of Mosman at a July 1972 by - election caused by the mid-term retirement of former Liberal Leader and Minister of the Crown , Pat Morton .