There are a couple of guides but they don't explain every step. I struggled to fix mine but in the end it is a simple fix.

1.Take out parcel shelf and lay upside down on a bench with the pull out part towards you.

2.Look at the end caps and you will see 4 slits. You need to remove the right hand one as  you look at it. In the car it will be on the left but you now have it upside down.

3.Insert screwdriver and break off piece of plastic between the slits.This part may not be necessary but it made it easier to see inside.

4.You should now be able to remove end cap with a bit of force and by pushing the locking tabs in.

5.The cap has two parts with a large spring in between. 

6.Take roller out completely, it just pulls out easily, and wind up as if you are rolling wrapping paper.

7.Put back into the sleeve.

8.Keep pressure on the rolled up shelf so it does unwind.

9. Take the piece of the end cap with the notch in that matches the notch on the end of the roller and match the two together.

10.Rotate the cap towards you about 15 times. This creates the tension.It is important to turn it the correct way.

11. This is the tricky bit. Push the cap back into the roller without releasing it or the roller will unwind! 

12.Once the cap is slotted back in,replace the outer part of the cap and the spring by sliding it back on.

13.It should now work properly. If it retracts too slowly repeat step 10 and wind it a few more times.

I hope this helps.  Difficult to explain but very simple once you figure it out.

Took me ages the first time but if I have to do it again it will take five minutes.

 

 

 

Thanks for this... My parcel shelf was annoying me as one side of it was not pulling as tight as the other when it was closed. I wanted to take it apart and wind up the tension bit couldnt figure out how to take it apart until i found this post. I also should have taken pictures but when you are doing this head melting job the last thing you think of is photos. 

I kept at it and got it apart. The reason one side of it was loose was because the double sided tape holding the bar to the material had come away from each other. I replaced the strip of tape and rolled it back up and put it back together. It took more than a few goes to get it back in and tensioned up... Its definately better than before but idealy I would like more tension when it's retracting. 

Thanks for this. My brother fixed mine and kept rolled up parcel shelf in position with gaffer tape before doing tension. Slotted back in place easily and once cap fixed back on removed tape.