I since edited the joints so that they now correctly link together
*Updated the file in drop box*
I'm now just struggling to stop the Magnet (Attached to rope, attached to helicopter) from being able to spin all the way round.
I tried a limited revolute joint but that just seemed to cause the magnet to bug between odd positions that I didn't set.
Thanks for the example, its not far off what I'm hoping to achieve but the hook of your rope is attached to a static object whereas mine is controlled by the player.