A method of assembling a surgically implantable fluid adjustable device (1). The device has an elongated substantially air impermeable flexible inflatable portion (10), an elongated flexible and substantially inextensible band portion (20) attached to the inflatable portion, and a catheter tube (50) in fluid communication with the inflatable portion. The catheter tube has a distal end (52) attached to the inflatable portion and an open proximal end (54) extending therefrom. The method involves substantially evacuating the inflatable portion of fluids, and inserting a removable plug (70) into the open proximal end of the catheter tube such that it substantially prevents introduction of air through the proximal end.
