Abstract: A device that assists in the tying of knots for tightening lines, especially ropes that hold heavy loads in place on trucks or flat bed trailers. In the preferred embodiment, the invention comprises two side members, two transverse members, and a clasping member. The clasping member moves between a closed position in which the side members, the lower transverse member and the clasping member form a closed loop, and an open position in which there is an opening between the side members. The clasping member is spring loaded and biased toward the closed position. One side member is turned back to form a hook, the end of which engages the clasping member in its closed position. The upper ends of the side members extend above the upper transverse member to form ears that prevent a rope tied around that member from slipping off.