Looking at the diagram in the manual it looks like the drivers side is different tabetha, it looks like the inner shaft slides in from the drivers side and then the part that is sticking out in the photo screws onto the end of it with what they call the support bush securing wire, but I cant work out from the diagram whether the securing wire is hidden within the rack tube or maybe it has come off and the end has started to unscrew, but in that case I thought I would of found the clip in the rubber boot,
as you said I will try and get some answers from someone that re-con's them to see what they say, and see if I can find the receipt I think it is still under a year since I got it.