The part no. you will need is:- v6q3 881 478 c7 1n v6q3 881 478 b7 1n/t
Cost was 5.52 plus vat
This is the part behind the adjuster wheel:-

To get some grip to pull the wheel off, you will need to remove the rubber ring. Just pick it off at an edge and you should be able to work your way around and peel it off:-

Next, take a firm grip of the wheel and give it a pull - it should come off. I found that easing it from the back made it easier to come off. This part is just clipped on:-

Now, get inside the back and look under the right section of the seat. You will see that the plastic is held on two clips on right and left sides. Ease the left side off first:-

then pull the right side so that the plastic is now free:-

It should look like this:-

Now, pull up and left and the piece should come totally out. I give mine a little wiggle and it came free:-

And heres the offending piece. You can't see clearly enough in the picture but the bottom is really warped:-

To refit new piece, repeat these steps in reverse!
Cheers,
e
