A device and method for preparation of a graft and a fastener for coupling to a vessel. The device includes a tubular body with a gripping head at a distal end to grip the graft and the fastener. The graft is threaded through the fastener and an edge of the graft out of the fastener. The gripping head has at least three segments arranged around its axis. The segments can be brought closer or pushed away from each other to modify the external diameter of the head and to provide firm gripping of the fastener and the graft. The device further includes a pliant tongue which may rotate around the tubular body. Radial positioning of the tongue may be controlled and the tongue may slide axially towards or away from the head.
