A tensioning system comprising: a spool rotatable about a winding axis; a torque generator for transmitting torque to the spool; and a brake for imparting rotational resistance to the spool; wherein the spool comprises: a first hub; a second hub; and a pair of connecting members (60,70) interconnecting the first hub and the second hub and configured for transmitting torque between the first hub and the second hub; wherein the pair of connecting members are spaced apart to form a gap for receiving a tensioning line to be tensioned by the spool, wherein the gap is delimited by surfaces of the first hub, the second hub and the pair of connecting members; and wherein the spool comprises a winding space for receiving said tensioning line when wound around the pair of connecting members (60,70), wherein a length (L1,L11) of the winding space in a direction of the winding axis is greater than a length of the gap in the direction of the winding axis; characterised in that a winding surface of the first hub and a winding surface of the second hub are inclined with respect to the winding axis at an angle less than 90 degrees. a spool rotatable about a winding axis; a torque generator for transmitting torque to the spool; and a brake for imparting rotational resistance to the spool; wherein the spool comprises: a first hub; a second hub; and a pair of connecting members (60,70) interconnecting the first hub and the second hub and configured for transmitting torque between the first hub and the second hub; wherein the pair of connecting members are spaced apart to form a gap for receiving a tensioning line to be tensioned by the spool, wherein the gap is delimited by surfaces of the first hub, the second hub and the pair of connecting members; and wherein the spool comprises a winding space for receiving said tensioning line when wound around the pair of connecting members (60,70), wherein a length (L1,L11) of the winding space in a direction of the winding axis is greater than a length of the gap in the direction of the winding axis; characterised in that a winding surface of the first hub and a winding surface of the second hub are inclined with respect to the winding axis at an angle less than 90 degrees. a first hub; a second hub; and a pair of connecting members (60,70) interconnecting the first hub and the second hub and configured for transmitting torque between the first hub and the second hub; wherein the pair of connecting members are spaced apart to form a gap for receiving a tensioning line to be tensioned by the spool, wherein the gap is delimited by surfaces of the first hub, the second hub and the pair of connecting members; and wherein the spool comprises a winding space for receiving said tensioning line when wound around the pair of connecting members (60,70), wherein a length (L1,L11) of the winding space in a direction of the winding axis is greater than a length of the gap in the direction of the winding axis; characterised in that a winding surface of the first hub and a winding surface of the second hub are inclined with respect to the winding axis at an angle less than 90 degrees. wherein the pair of connecting members are spaced apart to form a gap for receiving a tensioning line to be tensioned by the spool, wherein the gap is delimited by surfaces of the first hub, the second hub and the pair of connecting members; and wherein the spool comprises a winding space for receiving said tensioning line when wound around the pair of connecting members (60,70), wherein a length (L1,L11) of the winding space in a direction of the winding axis is greater than a length of the gap in the direction of the winding axis; characterised in that a winding surface of the first hub and a winding surface of the second hub are inclined with respect to the winding axis at an angle less than 90 degrees.