Abstract: A knotter assembly is used with a baler and configured to form knots in strands of a binding material used to secure a formed bale. The knotter assembly has a rotatably driven knotter disc, a rotary billhook driven by the knotter disc, and a twine disc assembly positioned adjacent the billhook for holding strands of binding material in position for engagement by the billhook. The billhook includes a billhook casting forming a platform, and a billhook tongue connected at a pivot point with the billhook casting. The platform has a first raised lip and a second raised lip forming a channel therebetween configured to receive the billhook tongue so as to firmly grasp the binding material. An upper surface of the first raised lip extends above an upper surface of the second raised lip.