A tensioning device for applying tension to a line extending between first and second objects. The tensioning device comprises a first engaging portion, a support surface, and first and second gripping portions defining a gripping notch. The first engaging portion is adapted to be connected to the first object. The support surface is adapted to support the line. The gripping notch is located adjacent to the support surface. The support surface supports the line to define a first line portion extending in a first direction, a second line portion in contact with the support surface, and a third line portion extending in a second direction. The third line portion is adapted to support the second object. The first line portion is pulled to place the line under tension. The gripping notch is arranged to engage the first line portion to inhibit movement of the line relative to the support surface.